@pippinford Your video didn't attach, so I can't comment on what you wanted to show from that. But I will say that it has never been advisable to change the graphics settings when you've already loaded a save. The only safe way to change them is to do so at the Main Menu and then quit to desktop. This does not apply to the resolution or the High-detail Lots setting, but almost all the others require a restart in order to avoid graphics glitches.
Additionally, you do not have a 2018 M1 MacBook Air: the M1 chip wasn't released until 2020. So please double-check your computer's specs and list them here.
