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

<Application
    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:local="using:Microsoft.PowerToys.Settings.UI"
    xmlns:controls="using:Microsoft.PowerToys.Settings.UI.Controls">
    <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <XamlControlsResources xmlns="using:Microsoft.UI.Xaml.Controls" />
                <ResourceDictionary Source="/Controls/KeyVisual/KeyVisual.xaml" />
                <ResourceDictionary Source="/Controls/IsEnabledTextBlock/IsEnabledTextBlock.xaml" />
                <ResourceDictionary Source="/Styles/TextBlock.xaml" />
                <ResourceDictionary Source="/Styles/Button.xaml"/>
                <ResourceDictionary Source="/Themes/Colors.xaml"/>
                <ResourceDictionary Source="/Themes/SettingsExpanderStyles.xaml"/>
                <!-- Other merged dictionaries here -->
            </ResourceDictionary.MergedDictionaries>

            <Thickness x:Key="InfoBarIconMargin">6,16,16,16</Thickness>
            <Thickness x:Key="InfoBarContentRootPadding">16,0,0,0</Thickness>
            <x:Double x:Key="SettingActionControlMinWidth">240</x:Double>

            <Style TargetType="ListViewItem">
                <Setter Property="Margin" Value="0,0,0,2" />
                <Setter Property="Padding" Value="0,0,0,0" />
                <Setter Property="HorizontalContentAlignment" Value="Stretch" />
                <Setter Property="IsTabStop" Value="False"/>
            </Style>

            <Style TargetType="controls:CheckBoxWithDescriptionControl" BasedOn="{StaticResource DefaultCheckBoxStyle}" />
            <!-- Other app resources here -->
        </ResourceDictionary>
    </Application.Resources>
</Application>