On my 16" M1 MacBook Pro both Return and Fn+Return edit the filename... does it work differently on yours?
The habit of using Enter has been so ingrained for so many years that I never tried pressing Return before now. Has that always worked? I suspect that it didn’t at some point in the past, though it may be you have to go back a long way. Or perhaps I've been mistaken about this for decades and never realised…