You can't. When you first hit LOG IN, that's the closest you can get.
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I think it can't be turned to fullscreen mode.
click on Options,then GFX options.Click on fullscreen-YES.
You can just click the fullscreen button above the Menu button. Cheers.
When you are playing a game, go to the options menu and press the box next to fullscreen mode
Go to options, click "Fullscreen." You should exit out of full screen. Now you can use cheat engine