How to make a game fit to all screen size - How do I

I tried doing activate full screen but then my sprites arent in aspect ratio and they look like and if i checked on maintain aspect ratio black bar makes the game even worst Can anyone help please

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Game is stuck like this, the game window is up there and doesn't fit my screen. I've tried turning fullscreen on/off, changing resolution/aspect ratio, nothing doing (Steam version) : r/StateOfDecay

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