Linux How to fix full screen issue. Im using Linux on a chromebook

Dheist

Newcomer
Hi! I have a Lenovo Chromebook and am using a Linux to play my steam games. I was playing stardew perfectly fine but then I went into the game settings and changed it to fullscreen. When I did this, the screen turned black making it impossible to switch it back. Now anytime I open the game the screen is all black. Anyone know how to change the game setting back to windowed without opening the game? Or how to reset the game settings without opening the game?
 
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