Answer by Liyun Zhang - MSFT for MAUI navigate the Flyout Items from codebehind

In your case, all of the three pages are root page. So you can call the following code to change the root page of the Navigation stack.

[RelayCommand]public void GoToPageTwo(){    //this opens a new instance of PageTwo    //and has a "Back" arrow on the top left    Shell.Current.GoToAsync("//PageTwo");}[RelayCommand]public void GoToPageThree(){    Shell.Current.GoToAsync("//PageThree");}

In addition, the Shell.Current.GoToAsync("///PageThree"); is also work. For more information, you can check the official document about Relative routes.