Wino-Mail/Wino.Mail.WinUI/App.xaml

<?xml version="1.0" encoding="utf-8" ?>
<Application
    x:Class="Wino.App"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="/Styles/Converters.xaml" />
                <ResourceDictionary Source="/Styles/FontIcons.xaml" />
                <ResourceDictionary Source="/Styles/Colors.xaml" />
                <ResourceDictionary Source="/Styles/ContentPresenters.xaml" />
                <ResourceDictionary Source="/Styles/ImagePreviewControl.xaml" />

                <XamlControlsResources xmlns="using:Microsoft.UI.Xaml.Controls" />
            </ResourceDictionary.MergedDictionaries>
            <!--  Other app resources here  -->
        </ResourceDictionary>
    </Application.Resources>
</Application>