ModernWpfPlayground/MainWindow.xaml

<Window
    x:Class="ModernWpfPlayground.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:local="clr-namespace:ModernWpfPlayground"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:ui="http://schemas.modernwpf.com/2019"
    x:Name="Window"
    Title="TaBEA 3.0.0"
    Width="800"
    Height="450"
    ui:TitleBar.ExtendViewIntoTitleBar="True"
    ui:WindowHelper.UseModernWindowStyle="True"
    mc:Ignorable="d">
    <Window.Resources>
        <local:PixelsToGridLengthConverter x:Key="PixelsToGridLength" />
    </Window.Resources>
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition />
        </Grid.RowDefinitions>

        <Grid x:Name="AppTitleBar" Height="{Binding ElementName=Window, Path=(ui:TitleBar.Height)}">
            <Grid.Style>
                <Style TargetType="Grid">
                    <Setter Property="TextElement.Foreground" Value="{DynamicResource SystemControlForegroundBaseHighBrush}" />
                    <Style.Triggers>
                        <DataTrigger Binding="{Binding IsActive, ElementName=Window}" Value="False">
                            <Setter Property="TextElement.Foreground" Value="{DynamicResource SystemControlDisabledBaseMediumLowBrush}" />
                        </DataTrigger>
                    </Style.Triggers>
                </Style>
            </Grid.Style>

            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="{Binding ElementName=Window, Path=(ui:TitleBar.SystemOverlayLeftInset), Converter={StaticResource PixelsToGridLength}}" />
                <ColumnDefinition Width="Auto" />
                <ColumnDefinition />
            </Grid.ColumnDefinitions>
            <Menu
                Grid.Column="1"
                Height="{Binding ElementName=Window, Path=(ui:TitleBar.Height)}"
                Margin="0"
                Padding="0"
                WindowChrome.IsHitTestVisibleInChrome="True">
                <Menu.Resources>
                    <Style BasedOn="{StaticResource {x:Type MenuItem}}" TargetType="MenuItem">
                        <Style.Triggers>
                            <Trigger Property="Role" Value="TopLevelHeader">
                                <Setter Property="Height" Value="{Binding ElementName=Window, Path=(ui:TitleBar.Height)}" />
                            </Trigger>
                            <DataTrigger Binding="{Binding IsActive, ElementName=Window}" Value="False">
                                <Setter Property="TextElement.Foreground" Value="{DynamicResource SystemControlDisabledBaseMediumLowBrush}" />
                            </DataTrigger>
                        </Style.Triggers>
                    </Style>
                </Menu.Resources>
                <MenuItem Header="File">
                    <MenuItem Header="New" />
                    <MenuItem Header="Open" />
                    <Separator />
                    <MenuItem Header="Close" />
                </MenuItem>
                <MenuItem Header="Edit">
                    <MenuItem Header="Copy" />
                    <MenuItem Header="Cut" />
                    <MenuItem Header="Paste" />
                </MenuItem>
                <MenuItem Header="Help">
                    <MenuItem Header="?" />
                    <Separator />
                    <MenuItem Header="Info" />
                </MenuItem>
            </Menu>
            <!--<ui:TitleBarButton
                x:Name="ForwardButton"
                Grid.Column="1"
                Content="&#xEA47;"
                Style="{StaticResource AppTitleBarBackButtonStyle}" />-->

            <!--  Horizontally centered title  -->
            <TextBlock
                Grid.Column="0"
                Grid.ColumnSpan="3"
                HorizontalAlignment="Center"
                VerticalAlignment="Center"
                FontSize="13"
                Text="{Binding ElementName=Window, Path=Title}" />

        </Grid>

    </Grid>
</Window>