“Default is full screen” is checked but not working

I’m a beginner and I’ve finished my game and I wanna build it,, I’ve built games before and everything worked just fine but now, when I build the game it appears in a window rather than full screen (like in the thumbnail)
And my resolution sittings above.
I’ve also had a “could not extract guid in text file” error when I tried before my last attempt.
Please help if you can