When you are playing a game, go to the options menu and press the box next to fullscreen mode
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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.
Go to options, click "Fullscreen." You should exit out of full screen. Now you can use cheat engine
You can now play on fullscreen by downloading the standalone version or by simply clicking the fullscreen button while playing.