ryujinx/Ryujinx.Ava/UI/Controls/NavigationDialogHost.axaml

<UserControl 
    xmlns="https://github.com/avaloniaui"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:ui="clr-namespace:FluentAvalonia.UI.Controls;assembly=FluentAvalonia"
    mc:Ignorable="d" 
    d:DesignWidth="800" 
    d:DesignHeight="450"
    x:Class="Ryujinx.Ava.UI.Controls.NavigationDialogHost"
    Focusable="True">
    <ui:Frame 
        HorizontalAlignment="Stretch"
        VerticalAlignment="Stretch"
        x:Name="ContentFrame">
    </ui:Frame>
</UserControl>