If you're using OBS, what you want to do is right click on the source, go to "Transform", and click on "Fit to Screen" or "Stretch to Screen" (Not sure what the difference between the two are). Although doing this causes the video to look stretched. If you're not using OBS than I don't know
What would happen if you stay in the locker for too long until Shadow Sonic manifests inside? Is he going to kill you for hiding too long? Because he keeps materializing inside the locker. So what happens if you stay in the locker for too long?