diff --git a/kcms/fonts/fonts.h b/kcms/fonts/fonts.h
--- a/kcms/fonts/fonts.h
+++ b/kcms/fonts/fonts.h
@@ -77,7 +77,6 @@
     bool save(KXftConfig::AntiAliasing::State aaState);
     void load();
     void defaults();
-    void setAntiAliasingState(KXftConfig::AntiAliasing::State aaState);
     QAbstractItemModel* subPixelOptionsModel() { return m_subPixelOptionsModel; }
     QAbstractItemModel* hintingOptionsModel() { return m_hintingOptionsModel; }
 
@@ -108,6 +107,7 @@
     void setHinting(int idx);
 
     bool needsSave() const;
+    bool isDefaults() const;
 
 #endif
 
@@ -158,7 +158,8 @@
     void fontsHaveChanged();
 
 private:
-    bool isSaveNeeded() const override ;
+    bool isSaveNeeded() const override;
+    bool isDefaults() const override;
     QFont applyFontDiff(const QFont &fnt, const QFont &newFont, int fontDiffFlags);
     void setNearestExistingFonts();
 
diff --git a/kcms/fonts/fonts.cpp b/kcms/fonts/fonts.cpp
--- a/kcms/fonts/fonts.cpp
+++ b/kcms/fonts/fonts.cpp
@@ -31,7 +31,6 @@
 #include <QWindow>
 #include <QQmlEngine>
 #include <QQuickView>
-#include <QDebug>
 #include <QFontDialog>
 #include <QApplication>
 #include <QFontDatabase>
@@ -470,6 +469,18 @@
     return m_state != m_originalState;
 }
 
+bool FontAASettings::isDefaults() const {
+    State defaultState{};
+    defaultState.exclude = false;
+    defaultState.excludeTo = 15;
+    defaultState.excludeFrom = 8;
+    defaultState.antiAliasing = true;
+    defaultState.dpi = 0;
+    defaultState.subPixel = KXftConfig::SubPixel::Rgb;
+    defaultState.hinting = KXftConfig::Hint::Slight;
+    return m_state == defaultState;
+}
+
 bool FontAASettings::State::operator==(const State& other) const
 {
     if (
@@ -510,18 +521,14 @@
 
     setButtons(Apply | Default | Help);
 
-    auto updateState = [this]() {
-        setNeedsSave(m_fontAASettings->needsSave());
-    };
-
-    connect(m_fontAASettings, &FontAASettings::subPixelCurrentIndexChanged, this, updateState);
-    connect(m_fontAASettings, &FontAASettings::hintingCurrentIndexChanged, this, updateState);
-    connect(m_fontAASettings, &FontAASettings::excludeChanged, this, updateState);
-    connect(m_fontAASettings, &FontAASettings::excludeFromChanged, this, updateState);
-    connect(m_fontAASettings, &FontAASettings::excludeToChanged, this, updateState);
-    connect(m_fontAASettings, &FontAASettings::antiAliasingChanged, this, updateState);
-    connect(m_fontAASettings, &FontAASettings::aliasingChanged, this, updateState);
-    connect(m_fontAASettings, &FontAASettings::dpiChanged, this, updateState);
+    connect(m_fontAASettings, &FontAASettings::subPixelCurrentIndexChanged, this, &KFonts::settingsChanged);
+    connect(m_fontAASettings, &FontAASettings::hintingCurrentIndexChanged, this, &KFonts::settingsChanged);
+    connect(m_fontAASettings, &FontAASettings::excludeChanged, this, &KFonts::settingsChanged);
+    connect(m_fontAASettings, &FontAASettings::excludeFromChanged, this, &KFonts::settingsChanged);
+    connect(m_fontAASettings, &FontAASettings::excludeToChanged, this, &KFonts::settingsChanged);
+    connect(m_fontAASettings, &FontAASettings::antiAliasingChanged, this, &KFonts::settingsChanged);
+    connect(m_fontAASettings, &FontAASettings::aliasingChanged, this, &KFonts::settingsChanged);
+    connect(m_fontAASettings, &FontAASettings::dpiChanged, this, &KFonts::settingsChanged);
 }
 
 KFonts::~KFonts()
@@ -601,6 +608,11 @@
     return m_fontAASettings->needsSave();
 }
 
+bool KFonts::isDefaults() const
+{
+    return m_fontAASettings->isDefaults();
+}
+
 void KFonts::adjustAllFonts()
 {
     QFont font = m_settings->font();
diff --git a/kcms/fonts/fontssettings.kcfg b/kcms/fonts/fontssettings.kcfg
--- a/kcms/fonts/fontssettings.kcfg
+++ b/kcms/fonts/fontssettings.kcfg
@@ -12,6 +12,7 @@
       QFont generalFont = QFont("Lucida Grande", 13);
       #else
       QFont generalFont = QFont("Noto Sans", 10);
+      generalFont.setStyleName("Regular");
       #endif
       </code>
       <default code="true">generalFont</default>
@@ -23,6 +24,7 @@
       QFont fixedWidthFont = QFont("Monaco", 10);
       #else
       QFont fixedWidthFont = QFont("Hack", 9);
+      fixedWidthFont.setStyleName("Regular");
       #endif
       </code>
       <default code="true">fixedWidthFont</default>
@@ -34,6 +36,7 @@
       QFont smallFont = QFont("Lucida Grande", 9);
       #else
       QFont smallFont = QFont("Noto Sans", 8);
+      smallFont.setStyleName("Regular");
       #endif
       </code>
       <default code="true">smallFont</default>
@@ -45,6 +48,7 @@
       QFont toolBarFont = QFont("Lucida Grande", 11);
       #else
       QFont toolBarFont = QFont("Noto Sans", 10);
+      toolBarFont.setStyleName("Regular");
       #endif
       </code>
       <default code="true">toolBarFont</default>
@@ -56,6 +60,7 @@
       QFont menuFont = QFont("Lucida Grande", 13);
       #else
       QFont menuFont = QFont("Noto Sans", 10);
+      menuFont.setStyleName("Regular");
       #endif
       </code>
       <default code="true">menuFont</default>
@@ -69,6 +74,7 @@
       QFont windowTitleFont = QFont("Lucida Grande", 14);
       #else
       QFont windowTitleFont = QFont("Noto Sans", 10);
+      windowTitleFont.setStyleName("Regular");
       #endif
       </code>
       <default code="true">windowTitleFont</default>