How to prevent loose Focus I Mac and PC build.

My system needs exclusive focus. So when you start the app it needs to be in full screen mode and then it will not leave till I press Application QUIT or EXIT. I want full focus not even windows or other even works. And if they press that the application ask if they want to leave for sure and then they can quit and go.

Its like an exam app and kids can not cheat. Hope this is clear.

well this is a “Input System” but you are having Display problem
any way here Edit/Project Settings

uncheck Allow Fullscreen Switch as well

Thanks for the reply. I do not want to switch out of the full screen. I want them to stay there till they press an exit button from my application.