Hi, here is a little description of what I do, I always make menu 6x6 & home page 5x5 (largest grid) biggest it can go, I enable developer options, enable show touches, I then make the font the smallest I can &lbe and change style if needed.. i set font zoom to 0, I then change resolution to full &, set adaptive refresh rate.. I change screen mode to vivid & just under vivid I always set custom colour tone, then full to the left for a cool white tone as I hate warm tones..
I then set wallpapers and download and login to apps. setup Samsung health & enjoy the phone
be sure tonuse widgets in your home screen really makes things interesting..
p.s don't forget to put device care widget on homepage but never activate device protection as you don't need it & will just slow down your phone..
I have s21 ultra 512gb