Enable, "Developer Options", for your phone and Animation Settings are in there. See...
Have you enabled it as per the video in my previous post?
As per my device signature in my posts... "My device... Galaxy S20 Ultra 5G 16/512GB (G988B D/S) CSC=BTU" It is not the S20 FE.
Are you running the latest bugfix update for the Samsung S20 FE?
Yes it does. I'm running the S20 FE 5G on Android 11 and it works just like it worked on Android 10 and in all my previous Samsung phones. If you can't activate developer options as instructed in that linked video, then there seems to be something wrong with your phone software. The best settings to speed up animations are in developer options. That's the first thing I always do when I set up a new Samsung phone, including this S20 FE 5G.