I will assume this is MV (as the other makers aren't supported on Mac).
This is not a bug. Unless part of your screen is missing and is there on other platforms, it simply means that your mac doesn't have the same aspect ratio than your game. Check the resolution on your mac, and compare it to your game's resolution.
This is on the Amazon page for the FF7 Remake: 'If you get the game early, please think of others and don't spoil it for them. Please don't post videos or screenshots of the game until it is officially on sale on April 10.'