When running a Power Apps app in desktop mode a Power Apps banner appears at the top of the screen. This banner occupies screen real estate without offering any useful functionality. Here I will show you how to hide the banner in Power Apps play mode.
To hide the Power Apps banner/navigation bar append your Power App play URL with:
&hidenavbar=true
So the full play URL will look something like this:
https://apps.powerapps.com/play/abdd456e-3b31-4d36-893d-f49e042a6b77?tenantId=f1b8b509-50a4-4a5c-8e48-bf3d3e7c10ed&hidenavbar=true