Answer by Liyun Zhang - MSFT for .Net MAUI Regions on screen

For the topbar you can use the Shell.TitleView. And for the rightbar, you can use the ContentPresenter and ControlTemplate.

Declare the ControlTemplate in the \Resources\Styles\Styles.xaml:

<ControlTemplate x:Key="rightbar"><Grid ColumnDefinitions="9*,1*" RowDefinitions="*,*,*"><ContentPresenter Grid.RowSpan="3" Grid.Column="0"/><Button Text="menu1" Grid.Row="0" Grid.Column="1"/><Button Text="menu2" Grid.Row="1" Grid.Column="1"/><Button Text="menu3" Grid.Row="2" Grid.Column="1"/></Grid></ControlTemplate>

Declare the Shell.TitleView in the AppShell.xaml:

<Shell.TitleView><Grid ColumnDefinitions="*,*,*,*"><Button Text="Menu1" Grid.Column="0"/><Button Text="Menu2" Grid.Column="1"/><Button Text="Menu3" Grid.Column="2"/><Button Text="Menu4" Grid.Column="3"/></Grid></Shell.TitleView><ShellContent        Title="Home"        ContentTemplate="{DataTemplate local:MainPage}"        Route="MainPage" />

And use the ControlTemplate in the Page:

<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"             ControlTemplate="{StaticResource rightbar}"             x:Class="MauiApp4.MainPage"><!--custom your page content in the contentpresenter--></ContentPage>

And the result image:

Of course, you can design the content of the bar by yourself.