well, last time I played I tried both and they didnt seem to do anything, I even tried closing and opening
but idk why I opened it just now to try it again to tell u if I noticed anything and it is full screen, well, it's kinda the same size but black borders cover the parts of the screen that it didnt fit to, I pressed F11 and that returned it to small and back to the black outline once I pressed it again
so after that I tried pressing alt+enter and it actually made it full screen, this is so weird, it didnt work any of the times before, maybe it was something of my computer? sometimes a ctrl or alt or shift key remains pressed on my pc, so maybe that's what happened