What to do if i can't enlarge an app anymore?

[Microsoft Windows]

I need help. When i was playing a game without paying attention i probably accidentally clicked some buttons and now whenever i open it i can't enlarge it, i can modify the dimension but i can't make it fit to make the tool bar disappear and it's really annoying. Even if i right click on it the full screen option is disabled. I'm not sure if i could make myself clear with this explenation but if you have any suggestion i'd be gratefull if you could share it. Thank you very much everyone.

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