dont show master switch if there are no required options

app/lib/features/geckoview/features/preferences/data/models/preference_setting.dart

@@ -33,6 +33,10 @@ class PreferenceSettingGroup with FastEquatable {
     (setting) => setting.requireUserOptIn || setting.isActive,
   );
 
+  bool get showMasterSwitch =>
+      settings.values.length >
+      settings.values.where((setting) => setting.requireUserOptIn).length;
+
   bool get isPartlyActive => settings.values.any((setting) => setting.isActive);
 
   bool get hasInactiveOptional => settings.values.any(

app/lib/features/settings/presentation/screens/web_engine_hardening_group.dart

@@ -47,6 +47,7 @@ class WebEngineHardeningGroupScreen extends HookConsumerWidget {
         data: (group) {
           return Column(
             children: [
+              if (group.showMasterSwitch)
                 Padding(
                   padding: const EdgeInsets.all(8.0),
                   child: Card(