How to make the game resolution a square

I'm getting really frustrated as I can't seem to make my game resolution a square. Ideally the list of resolutions would all be a square ratio, and fullscreen would be disabled. But unfortunately, That's not working out. I got a previous game to skip the resolution dialog and always run at 500 by 700 and it worked fine. But now, in my new project, if I go into the player settings make it 700 by 700 and run it with or without the resolution dialog, 700 by 700 is never on the list or runs at a larger wider resolution. I can select 700 by 700 in the game view in the editor, just not when I run the game.

Is there any way I can make all the resolutions on the list be squares and without fullscreen? Or at the very least, force the screen to be a square?

Thanks in advance.