App.xaml

<Application x:Class="beforewindeploy.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:beforewindeploy"
             StartupUri="MainWindow.xaml"
             xmlns:ui="http://schemas.inkore.net/lib/ui/wpf/modern">
    <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ui:ThemeResources />
                <ui:XamlControlsResources />
            </ResourceDictionary.MergedDictionaries>
            <Style x:Key="SegoeUIVariable">
                <Setter Property="TextElement.FontFamily" Value="pack://application:,,,/Fonts/#Segoe UI Variable Display"/>
            </Style>
        </ResourceDictionary>
    </Application.Resources>
</Application>