PowerToys/src/settings-ui/Microsoft.PowerToys.Settings.UI/App.xaml

<xaml:XamlApplication
    x:Class="Microsoft.PowerToys.Settings.UI.App"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:xaml="using:Microsoft.Toolkit.Win32.UI.XamlHost"
    xmlns:converters="using:Microsoft.PowerToys.Settings.UI.Converters">
    <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <XamlControlsResources xmlns="using:Microsoft.UI.Xaml.Controls" ControlsResourcesVersion="Version2" />
                <ResourceDictionary Source="/Controls/KeyVisual/KeyVisual.xaml" />
                <ResourceDictionary Source="/Styles/_FontSizes.xaml" />
                <ResourceDictionary Source="/Styles/_Thickness.xaml" />
                <ResourceDictionary Source="/Styles/_Sizes.xaml" />
                <ResourceDictionary Source="/Styles/TextBlock.xaml" />
                <ResourceDictionary Source="/Styles/Button.xaml"/>

                <ResourceDictionary Source="/Themes/Colors.xaml"/>
                <ResourceDictionary Source="/Themes/SettingsExpanderStyles.xaml"/>
                <ResourceDictionary Source="/Themes/SettingsSectionStyles.xaml"/>
            </ResourceDictionary.MergedDictionaries>
            
            <converters:ModuleEnabledToOpacityConverter x:Key="ModuleEnabledToOpacityConverter"/>

            <ResourceDictionary.ThemeDictionaries>
                <ResourceDictionary x:Key="Light">
                    <SolidColorBrush x:Key="HomePageBackgroundBrush" Color="Transparent"/>
                    <SolidColorBrush x:Key="PageHeaderForegroundBrush" Color="White"/>
                    <StaticResource x:Key="ControlExampleDisplayBrush" ResourceKey="SolidBackgroundFillColorBaseBrush" />
                    <Thickness x:Key="ControlExampleDisplayBorderThickness">0</Thickness>
                    <SolidColorBrush x:Key="NavigationViewExpandedPaneBackground" Color="Transparent"/>
                </ResourceDictionary>
                <ResourceDictionary x:Key="Dark">
                    <SolidColorBrush x:Key="HomePageBackgroundBrush" Color="Transparent"/>
                    <SolidColorBrush x:Key="PageHeaderForegroundBrush" Color="White"/>
                    <StaticResource x:Key="ControlExampleDisplayBrush" ResourceKey="SolidBackgroundFillColorBaseBrush" />
                    <Thickness x:Key="ControlExampleDisplayBorderThickness">0</Thickness>
                    <SolidColorBrush x:Key="NavigationViewExpandedPaneBackground" Color="Transparent"/>
                </ResourceDictionary>
                <ResourceDictionary x:Key="HighContrast">
                    <SolidColorBrush x:Key="HomePageBackgroundBrush" Color="{ThemeResource SystemColorWindowColor}" />
                    <SolidColorBrush x:Key="PageHeaderForegroundBrush" Color="White"/>
                    <SolidColorBrush x:Key="ControlExampleDisplayBrush" Color="{ThemeResource SystemColorWindowColor}" />
                    <Thickness x:Key="ControlExampleDisplayBorderThickness">1</Thickness>
                    <SolidColorBrush x:Key="NavigationViewExpandedPaneBackground" Color="Transparent"/>
                </ResourceDictionary>
            </ResourceDictionary.ThemeDictionaries>



       
            
        </ResourceDictionary>


    </Application.Resources>
</xaml:XamlApplication>