diff --git a/kcms/style/package/contents/ui/EffectSettingsPopup.qml b/kcms/style/package/contents/ui/EffectSettingsPopup.qml
--- a/kcms/style/package/contents/ui/EffectSettingsPopup.qml
+++ b/kcms/style/package/contents/ui/EffectSettingsPopup.qml
@@ -42,18 +42,21 @@
             id: iconsOnButtonsCheckBox
             Kirigami.FormData.label: i18n("Show icons:")
             text: i18n("On buttons")
+            enabled: !kcm.styleSettings.isImmutable("iconsOnButtons")
             checked: kcm.styleSettings.iconsOnButtons
             onClicked: kcm.styleSettings.iconsOnButtons = checked
         }
 
         QtControls.CheckBox {
             text: i18n("In menus")
+            enabled: !kcm.styleSettings.isImmutable("iconsInMenus")
             checked: kcm.styleSettings.iconsInMenus
             onClicked: kcm.styleSettings.iconsInMenus = checked
         }
 
         QtControls.ComboBox {
             id: mainToolBarStyleCombo
+            enabled: !kcm.styleSettings.isImmutable("toolButtonStyle")
             Kirigami.FormData.label: i18n("Main toolbar label:")
             model: [
                 {text: i18n("None"), value: Private.KCM.NoText},
@@ -69,6 +72,7 @@
         }
 
         QtControls.ComboBox {
+            enabled: !kcm.styleSettings.isImmutable("toolButtonStyleOtherToolbars")
             Kirigami.FormData.label: i18n("Secondary toolbar label:")
             model: mainToolBarStyleCombo.model
             textRole: "text"
diff --git a/kcms/style/package/contents/ui/main.qml b/kcms/style/package/contents/ui/main.qml
--- a/kcms/style/package/contents/ui/main.qml
+++ b/kcms/style/package/contents/ui/main.qml
@@ -33,6 +33,8 @@
     view.model: kcm.model
     view.currentIndex: kcm.model.selectedStyleIndex
 
+    view.enabled: !kcm.styleSettings.isImmutable("widgetStyle")
+
     Component.onCompleted: {
         // The widget thumbnails are a bit more elaborate and need more room, especially when translated
         view.implicitCellWidth = Kirigami.Units.gridUnit * 20;