Changed the screen scaling and now I can't fix it

I used a theme and it changed the screen scaling. I was curious what screen scaling actually does so I went in preferences to check it. I changed one value from 100% to 200% if I remember correctly and Now I can’t go back to change it. Please help!

Ok, never mind I found out how to fix this. Just needed to delete everything in

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Just in case, you can also reset the Screen/UI Scaling parameters clicking the red flag at the top-right corner: