When I alt tab too many times sometimes in my obs my screen shows black bars. and i don't know how to restore it back to stretch. i can go the longest (weeks) where i'm alt tabbing a million times a day and nothing goes wrong. then I can alt tab once and it goes to black bars on obs. still stretched in my game and everything, but on black bars on my obs. Fit to screen and stretch to screen isn't either. I just wait some days and keep messing around with switching from 16:9 back to 4:3.