Removing the retina 2x button

I’m trying to make a game on osx on an ipad where I won’t be allowing the user to change from 1x to 2x and I need all of the screen to do what I want to do so can’t have that border either. Is that something I can do?

figured it out, after not seeing anything about it in of code I thought it must be apples doing. i noticed the correct size and named splash screen pic wasn’t added so I made one and set it in the project options. after that it was all fine. without the correct splash screen ios won’t know what view to create so it creates a small one.