InkForge/app/InkForge.Desktop/App.axaml

<Application xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             x:Class="InkForge.Desktop.App"
             RequestedThemeVariant="Default">

    <Application.Styles>
        <FluentTheme />
        <StyleInclude Source="avares://AvaloniaEdit/Themes/Fluent/AvaloniaEdit.xaml" />
        <StyleInclude Source="avares://Avalonia.Controls.DataGrid/Themes/Fluent.xaml" />
        <DockFluentTheme />
    </Application.Styles>

    <Application.Resources>
        <FontFamily x:Key="FluentSystemIcons-Filled">/Assets/Fonts#FluentSystemIcons-Filled</FontFamily>
        <FontFamily x:Key="FluentSystemIcons-Regular">/Assets/Fonts#FluentSystemIcons-Regular</FontFamily>
    </Application.Resources>
</Application>