diff --git a/kcms/fonts/fonts.h b/kcms/fonts/fonts.h
--- a/kcms/fonts/fonts.h
+++ b/kcms/fonts/fonts.h
@@ -113,6 +113,7 @@
     void excludeToChanged();
     void excludeFromChanged();
     void antiAliasingChanged();
+    void aliasingChangeApplied();
     void aliasingChanged();
     void dpiChanged();
     void subPixelCurrentIndexChanged();
diff --git a/kcms/fonts/fonts.cpp b/kcms/fonts/fonts.cpp
--- a/kcms/fonts/fonts.cpp
+++ b/kcms/fonts/fonts.cpp
@@ -288,29 +288,22 @@
     // TODO: With AASystem the changes already made by this module should be reverted somehow.
 #if defined(HAVE_FONTCONFIG) && defined (HAVE_X11)
     if (mod || (m_state.antiAliasing != m_originalState.antiAliasing) || m_state.dpi != m_originalState.dpi) {
-        KMessageBox::information(nullptr,
-                                 i18n(
-                                     "<p>Some changes such as anti-aliasing or DPI will only affect newly started applications.</p>"
-                                 ), i18n("Font Settings Changed"), "FontSettingsChanged");
         m_originalState.antiAliasing = m_state.antiAliasing;
         m_originalState.dpi = m_state.dpi;
+        emit aliasingChangeApplied();
     }
 #else
 #if HAVE_X11
     if (m_state.dpi != m_originalState.dpi) {
-        KMessageBox::information(0,
-                                 i18n(
-                                     "<p>Some changes such as DPI will only affect newly started applications.</p>"
-                                 ), i18n("Font Settings Changed"), "FontSettingsChanged");
         m_originalState.dpi = m_state.dpi;
     }
 #endif
 #endif
 
     m_originalState.exclude = m_state.exclude;
     m_originalState.excludeTo = m_state.excludeTo;
     m_originalState.excludeFrom = m_state.excludeFrom;
-    
+
     m_originalState.subPixel = m_state.subPixel;
     m_originalState.hinting = m_state.hinting;
 
@@ -542,7 +535,7 @@
     m_windowTitleFont = m_windowTitleFontOriginal = nearestExistingFont(cg.readEntry("activeFont", m_defaultFont));
 
     engine()->addImageProvider("preview", new PreviewImageProvider(generalFont()));
-    
+
     emit generalFontChanged();
     emit fixedWidthFontChanged();
     emit smallFontChanged();
diff --git a/kcms/fonts/package/contents/ui/main.qml b/kcms/fonts/package/contents/ui/main.qml
--- a/kcms/fonts/package/contents/ui/main.qml
+++ b/kcms/fonts/package/contents/ui/main.qml
@@ -21,222 +21,236 @@
 import QtQuick.Layouts 1.1
 import QtQuick.Controls 2.0 as QtControls
 import QtQuick.Dialogs 1.2 as QtDialogs
-import org.kde.kirigami 2.3 as Kirigami
+import org.kde.kirigami 2.4 as Kirigami
 import org.kde.kcm 1.1 as KCM
 
 KCM.SimpleKCM {
     id: root
 
     KCM.ConfigModule.quickHelp: i18n("This module lets you configure the system fonts.")
 
-    Kirigami.FormLayout {
-        id: formLayout
-        readonly property int maxImplicitWidth: Math.max(adjustAllFontsButton.implicitWidth, excludeField.implicitWidth, subPixelCombo.implicitWidth, hintingCombo.implicitWidth)
+    ColumnLayout {
 
-        QtControls.Button {
-            id: adjustAllFontsButton
-            Layout.preferredWidth: formLayout.maxImplicitWidth
-            icon.name: "font-select-symbolic"
-            text: i18n("&Adjust All Fonts...")
+        Kirigami.InlineMessage {
+            id: antiAliasingMessage
+            Layout.fillWidth: true
+            showCloseButton: true
+            text: i18n("Some changes such as anti-aliasing or DPI will only affect newly started applications.")
 
-            onClicked: kcm.adjustAllFonts();
+            Connections {
+                target: kcm.fontAASettings
+                onAliasingChangeApplied: antiAliasingMessage.visible = true
+            }
         }
 
-        FontWidget {
-            id: generalFontWidget
-            label: i18n("General:")
-            category: "generalFont"
-            font: kcm.generalFont
-        }
-        FontWidget {
-            label: i18n("Fixed width:")
-            category: "fixedWidthFont"
-            font: kcm.fixedWidthFont
-        }
-        FontWidget {
-            label: i18n("Small:")
-            category: "smallFont"
-            font: kcm.smallFont
-        }
-        FontWidget {
-            label: i18n("Toolbar:")
-            category: "toolbarFont"
-            font: kcm.toolbarFont
-        }
-        FontWidget {
-            label: i18n("Menu:")
-            category: "menuFont"
-            font: kcm.menuFont
-        }
-        FontWidget {
-            label: i18n("Window title:")
-            category: "windowTitleFont"
-            font: kcm.windowTitleFont
-        }
-        
-        Kirigami.Separator {
-            Kirigami.FormData.isSection: true
-        }
+        Kirigami.FormLayout {
+            id: formLayout
+            readonly property int maxImplicitWidth: Math.max(adjustAllFontsButton.implicitWidth, excludeField.implicitWidth, subPixelCombo.implicitWidth, hintingCombo.implicitWidth)
 
-        QtControls.CheckBox {
-            id: antiAliasingCheckBox
-            checked: kcm.fontAASettings.antiAliasing
-            onCheckedChanged: kcm.fontAASettings.antiAliasing = checked
-            Kirigami.FormData.label: i18n("Anti-Aliasing:")
-            text: i18n("Enable")
-            Layout.fillWidth: true
-        }
+            QtControls.Button {
+                id: adjustAllFontsButton
+                Layout.preferredWidth: formLayout.maxImplicitWidth
+                icon.name: "font-select-symbolic"
+                text: i18n("&Adjust All Fonts...")
 
-        QtControls.CheckBox {
-            id: excludeCheckBox
-            checked: kcm.fontAASettings.exclude
-            onCheckedChanged: kcm.fontAASettings.exclude = checked;
-            text: i18n("Exclude range from anti-aliasing")
-            Layout.fillWidth: true
-            enabled: antiAliasingCheckBox.checked
-        }
+                onClicked: kcm.adjustAllFonts();
+            }
 
-        RowLayout {
-            id: excludeField
-            Layout.preferredWidth: formLayout.maxImplicitWidth
-            enabled: antiAliasingCheckBox.checked
-            QtControls.SpinBox {
-                id: excludeFromSpinBox
-                stepSize: 1
-                onValueChanged: kcm.fontAASettings.excludeFrom = value
-                textFromValue: function(value, locale) { return i18n("%1 pt", value)}
-                enabled: excludeCheckBox.checked
+            FontWidget {
+                id: generalFontWidget
+                label: i18n("General:")
+                category: "generalFont"
+                font: kcm.generalFont
+            }
+            FontWidget {
+                label: i18n("Fixed width:")
+                category: "fixedWidthFont"
+                font: kcm.fixedWidthFont
+            }
+            FontWidget {
+                label: i18n("Small:")
+                category: "smallFont"
+                font: kcm.smallFont
+            }
+            FontWidget {
+                label: i18n("Toolbar:")
+                category: "toolbarFont"
+                font: kcm.toolbarFont
+            }
+            FontWidget {
+                label: i18n("Menu:")
+                category: "menuFont"
+                font: kcm.menuFont
+            }
+            FontWidget {
+                label: i18n("Window title:")
+                category: "windowTitleFont"
+                font: kcm.windowTitleFont
             }
 
-            QtControls.Label {
-                Layout.fillWidth: true
-                horizontalAlignment: Text.AlignHCenter
-                text: i18n("to")
-                enabled: excludeCheckBox.checked
+            Kirigami.Separator {
+                Kirigami.FormData.isSection: true
             }
 
-            QtControls.SpinBox {
-                id: excludeToSpinBox
-                stepSize: 1
-                onValueChanged: kcm.fontAASettings.excludeTo = value
-                textFromValue: function(value, locale) { return i18n("%1 pt", value)}
-                enabled: excludeCheckBox.checked
+            QtControls.CheckBox {
+                id: antiAliasingCheckBox
+                checked: kcm.fontAASettings.antiAliasing
+                onCheckedChanged: kcm.fontAASettings.antiAliasing = checked
+                Kirigami.FormData.label: i18n("Anti-Aliasing:")
+                text: i18n("Enable")
+                Layout.fillWidth: true
             }
-            Connections {
-                target: kcm.fontAASettings
-                onExcludeFromChanged: excludeFromSpinBox.value = kcm.fontAASettings.excludeFrom;
-                onExcludeToChanged: excludeToSpinBox.value = kcm.fontAASettings.excludeTo;
+
+            QtControls.CheckBox {
+                id: excludeCheckBox
+                checked: kcm.fontAASettings.exclude
+                onCheckedChanged: kcm.fontAASettings.exclude = checked;
+                text: i18n("Exclude range from anti-aliasing")
+                Layout.fillWidth: true
+                enabled: antiAliasingCheckBox.checked
             }
-        }
 
-        QtControls.ComboBox {
-            id: subPixelCombo
-            Layout.preferredWidth: formLayout.maxImplicitWidth
-            Kirigami.FormData.label: i18nc("Used as a noun, and precedes a combobox full of options", "Sub-pixel rendering:")
-            currentIndex: kcm.fontAASettings.subPixelCurrentIndex
-            onCurrentIndexChanged: kcm.fontAASettings.subPixelCurrentIndex = currentIndex;
-            model: kcm.fontAASettings.subPixelOptionsModel
-            textRole: "display"
-            enabled: antiAliasingCheckBox.checked
-            popup.height: popup.implicitHeight
-            delegate: QtControls.ItemDelegate {
-                id: subPixelDelegate
-                onWidthChanged: {
-                    subPixelCombo.popup.width = Math.max(subPixelCombo.popup.width, width)
+            RowLayout {
+                id: excludeField
+                Layout.preferredWidth: formLayout.maxImplicitWidth
+                enabled: antiAliasingCheckBox.checked
+                QtControls.SpinBox {
+                    id: excludeFromSpinBox
+                    stepSize: 1
+                    onValueChanged: kcm.fontAASettings.excludeFrom = value
+                    textFromValue: function(value, locale) { return i18n("%1 pt", value)}
+                    enabled: excludeCheckBox.checked
                 }
-                contentItem: ColumnLayout {
-                    id: subPixelLayout
-                    Kirigami.Heading {
-                        id: subPixelComboText
-                        text: model.display
-                        level: 5
+
+                QtControls.Label {
+                    Layout.fillWidth: true
+                    horizontalAlignment: Text.AlignHCenter
+                    text: i18n("to")
+                    enabled: excludeCheckBox.checked
+                }
+
+                QtControls.SpinBox {
+                    id: excludeToSpinBox
+                    stepSize: 1
+                    onValueChanged: kcm.fontAASettings.excludeTo = value
+                    textFromValue: function(value, locale) { return i18n("%1 pt", value)}
+                    enabled: excludeCheckBox.checked
+                }
+                Connections {
+                    target: kcm.fontAASettings
+                    onExcludeFromChanged: excludeFromSpinBox.value = kcm.fontAASettings.excludeFrom;
+                    onExcludeToChanged: excludeToSpinBox.value = kcm.fontAASettings.excludeTo;
+                }
+            }
+
+            QtControls.ComboBox {
+                id: subPixelCombo
+                Layout.preferredWidth: formLayout.maxImplicitWidth
+                Kirigami.FormData.label: i18nc("Used as a noun, and precedes a combobox full of options", "Sub-pixel rendering:")
+                currentIndex: kcm.fontAASettings.subPixelCurrentIndex
+                onCurrentIndexChanged: kcm.fontAASettings.subPixelCurrentIndex = currentIndex;
+                model: kcm.fontAASettings.subPixelOptionsModel
+                textRole: "display"
+                enabled: antiAliasingCheckBox.checked
+                popup.height: popup.implicitHeight
+                delegate: QtControls.ItemDelegate {
+                    id: subPixelDelegate
+                    onWidthChanged: {
+                        subPixelCombo.popup.width = Math.max(subPixelCombo.popup.width, width)
                     }
-                    Image {
-                        id: subPixelComboImage
-                        source: "image://preview/" + model.index + "_" + kcm.fontAASettings.hintingCurrentIndex + ".png"
-                        // Setting sourceSize here is necessary as a workaround for QTBUG-38127
-                        //
-                        // With this bug, images requested from a QQuickImageProvider have an incorrect scale with devicePixelRatio != 1 when sourceSize is not set.
-                        //
-                        // TODO: Check if QTBUG-38127 is fixed and remove the next two lines.
-                        sourceSize.width: 1
-                        sourceSize.height: 1
+                    contentItem: ColumnLayout {
+                        id: subPixelLayout
+                        Kirigami.Heading {
+                            id: subPixelComboText
+                            text: model.display
+                            level: 5
+                        }
+                        Image {
+                            id: subPixelComboImage
+                            source: "image://preview/" + model.index + "_" + kcm.fontAASettings.hintingCurrentIndex + ".png"
+                            // Setting sourceSize here is necessary as a workaround for QTBUG-38127
+                            //
+                            // With this bug, images requested from a QQuickImageProvider have an incorrect scale with devicePixelRatio != 1 when sourceSize is not set.
+                            //
+                            // TODO: Check if QTBUG-38127 is fixed and remove the next two lines.
+                            sourceSize.width: 1
+                            sourceSize.height: 1
+                        }
                     }
                 }
             }
-        }
 
-        QtControls.ComboBox {
-            id: hintingCombo
-            Layout.preferredWidth: formLayout.maxImplicitWidth
-            Kirigami.FormData.label: i18nc("Used as a noun, and precedes a combobox full of options", "Hinting:")
-            currentIndex: kcm.fontAASettings.hintingCurrentIndex
-            onCurrentTextChanged: kcm.fontAASettings.hintingCurrentIndex = currentIndex;
-            model: kcm.fontAASettings.hintingOptionsModel
-            textRole: "display"
-            enabled: antiAliasingCheckBox.checked
-            popup.height: popup.implicitHeight
-            delegate: QtControls.ItemDelegate {
-                id: hintingDelegate
-                onWidthChanged: {
-                    hintingCombo.popup.width = Math.max(hintingCombo.popup.width, width)
-                }
-                contentItem: ColumnLayout {
-                    id: hintingLayout
-                    Kirigami.Heading {
-                        id: hintingComboText
-                        text: model.display
-                        level: 5
+            QtControls.ComboBox {
+                id: hintingCombo
+                Layout.preferredWidth: formLayout.maxImplicitWidth
+                Kirigami.FormData.label: i18nc("Used as a noun, and precedes a combobox full of options", "Hinting:")
+                currentIndex: kcm.fontAASettings.hintingCurrentIndex
+                onCurrentTextChanged: kcm.fontAASettings.hintingCurrentIndex = currentIndex;
+                model: kcm.fontAASettings.hintingOptionsModel
+                textRole: "display"
+                enabled: antiAliasingCheckBox.checked
+                popup.height: popup.implicitHeight
+                delegate: QtControls.ItemDelegate {
+                    id: hintingDelegate
+                    onWidthChanged: {
+                        hintingCombo.popup.width = Math.max(hintingCombo.popup.width, width)
                     }
-                    Image {
-                        id: hintingComboImage
-                        source: "image://preview/" + kcm.fontAASettings.subPixelCurrentIndex + "_" + model.index + ".png"
-                        // Setting sourceSize here is necessary as a workaround for QTBUG-38127
-                        //
-                        // With this bug, images requested from a QQuickImageProvider have an incorrect scale with devicePixelRatio != 1 when sourceSize is not set.
-                        //
-                        // TODO: Check if QTBUG-38127 is fixed and remove the next two lines.
-                        sourceSize.width: 1
-                        sourceSize.height: 1
+                    contentItem: ColumnLayout {
+                        id: hintingLayout
+                        Kirigami.Heading {
+                            id: hintingComboText
+                            text: model.display
+                            level: 5
+                        }
+                        Image {
+                            id: hintingComboImage
+                            source: "image://preview/" + kcm.fontAASettings.subPixelCurrentIndex + "_" + model.index + ".png"
+                            // Setting sourceSize here is necessary as a workaround for QTBUG-38127
+                            //
+                            // With this bug, images requested from a QQuickImageProvider have an incorrect scale with devicePixelRatio != 1 when sourceSize is not set.
+                            //
+                            // TODO: Check if QTBUG-38127 is fixed and remove the next two lines.
+                            sourceSize.width: 1
+                            sourceSize.height: 1
+                        }
                     }
                 }
             }
-        }
 
-        RowLayout {
-            QtControls.CheckBox {
-                id: dpiCheckBox
-                checked: kcm.fontAASettings.dpi !== 0
-                text: i18n("Force font DPI:")
-                onClicked: kcm.fontAASettings.dpi = (checked ? dpiSpinBox.value : 0)
-            }
-
-            QtControls.SpinBox {
-                id: dpiSpinBox
-                stepSize: 24
-                editable: true
-                enabled: dpiCheckBox.checked
-                value: kcm.fontAASettings.dpi !== 0 ? kcm.fontAASettings.dpi : 96
-                onValueModified: kcm.fontAASettings.dpi = value
-                to: 1000
-                from: 1
+            RowLayout {
+                QtControls.CheckBox {
+                    id: dpiCheckBox
+                    checked: kcm.fontAASettings.dpi !== 0
+                    text: i18n("Force font DPI:")
+                    onClicked: kcm.fontAASettings.dpi = (checked ? dpiSpinBox.value : 0)
+                }
+
+                QtControls.SpinBox {
+                    id: dpiSpinBox
+                    stepSize: 24
+                    editable: true
+                    enabled: dpiCheckBox.checked
+                    value: kcm.fontAASettings.dpi !== 0 ? kcm.fontAASettings.dpi : 96
+                    onValueModified: kcm.fontAASettings.dpi = value
+                    to: 1000
+                    from: 1
+                }
             }
-        }
 
-        QtDialogs.FontDialog {
-            id: fontDialog
-            title: i18n("Select Font")
-            modality: Qt.WindowModal
-            property string currentCategory
-            property bool adjustAllFonts: false
-            onAccepted: {
-                if (adjustAllFonts) {
-                    kcm.adjustAllFonts(font);
-                } else {
-                    kcm[currentCategory] = font;
+            QtDialogs.FontDialog {
+                id: fontDialog
+                title: i18n("Select Font")
+                modality: Qt.WindowModal
+                property string currentCategory
+                property bool adjustAllFonts: false
+                onAccepted: {
+                    if (adjustAllFonts) {
+                        kcm.adjustAllFonts(font);
+                    } else {
+                        kcm[currentCategory] = font;
+                    }
                 }
             }
         }
     }
 }
-