Not sure if this is an MS issue or regular windows behaviour:
Windows 10 in tablet mode, MobileSheets with "Full screen mode" disabled. Open a setlist. Touch the Windows Back button (next to Start button): the Windows start menu is shown instead of the previous screen in Mobilesheets.
Windows 10 in tablet mode, MobileSheets with "Full screen mode" disabled. Open a setlist. Touch the Windows Back button (next to Start button): the Windows start menu is shown instead of the previous screen in Mobilesheets.