Is there a way to disable the default view completley?

Hello there, I am using Unreal Engine to make an app based in UMG. I have a render target that grabs the game view and displays it in a viewport, which is perfect for my necessary use.

However, the normal game viewport is in the background behind the UMG and is just sitting there, I am currently making a trick by spawning a giant mask UMG behind the menu UMG, but curious if there is a more optimal or official way.

Thank you very much.