这其实很简单：
在XAML代码中：这段代码向TabView添加了一个ShellTitlebarInset和一个CustomDragRegion。这是在窗口的左边和右边添加边距所必需的。

<muxc:TabView x:Name="tabView">
    <muxc:TabView.TabStripHeader>
        <Grid x:Name="ShellTitlebarInset" Background="Transparent" />
    </muxc:TabView.TabStripHeader>
    <muxc:TabView.TabStripFooter>
        <Grid x:Name="CustomDragRegion" MinWidth="188" Loaded="CustomDragRegion_Loaded" Background="Transparent" />
    </muxc:TabView.TabStripFooter>
    
    <muxc:TabViewItem Header="Tab1"/>
    <muxc:TabViewItem Header="Tab2"/>
    <muxc:TabViewItem Header="Tab3"/>
</muxc:TabView>

在您的主页中：
LayoutMetricsChanged事件处理从左向右或从右向左的流向，以将特定边距添加到CustomDragRegion和ShellTitlebarInset。

private void CoreTitleBar_LayoutMetricsChanged(CoreApplicationViewTitleBar sender, object args)
{
    if (FlowDirection == FlowDirection.LeftToRight)
    {
        CustomDragRegion.MinWidth = sender.SystemOverlayRightInset;
        ShellTitlebarInset.MinWidth = sender.SystemOverlayLeftInset;
    }
    else
    {
        CustomDragRegion.MinWidth = sender.SystemOverlayLeftInset;
        ShellTitlebarInset.MinWidth = sender.SystemOverlayRightInset;
    }

    CustomDragRegion.Height = ShellTitlebarInset.Height = sender.Height;
}

//Make sure to extend the view after the CustomDragRegion loaded, otherwise the tabs may clip under the minimize, maximize and close buttons of the window:
private void CustomDragRegion_Loaded(object sender, RoutedEventArgs e)
{
    var coreTitleBar = CoreApplication.GetCurrentView().TitleBar;
    coreTitleBar.ExtendViewIntoTitleBar = true;
    coreTitleBar.LayoutMetricsChanged += CoreTitleBar_LayoutMetricsChanged;

    Window.Current.SetTitleBar(CustomDragRegion);
}

这里还有微软的官方文档：
https://learn.microsoft.com/en-us/windows/apps/design/controls/tab-view