Game unplayable, not rendering properly.

When I start Minecraft and I get to the menu screen, the only thing that shows up is the background (panning some nether biome). No words or buttons show up BUT if I click the spot where they should be it does do something and eventually through a lot of clicking around I can get to the realms screen, then click back to the servers screen. So from there I can start playing, but when I get in a world, nothing looks right (jpg attached). I can see mobs and players, animals, etc., but the environment is so messed up I can't even see where my player is going. I tried uninstalling and reinstalling the game, before I figured out how to actually get into any menus, therefore I wasn't able to back anything up first, and the same bugs are all there, but now my worlds that my kids, husband, and I (mostly the kids) have spent the last 3 years creating are all gone. The game is still unplayable and if reinstalling it didn't fix it I don't know what else to do. I tried updating my graphics drivers and running Windows Update. Please help.

P.S. I forgot to mention, this all happened immediately after updating to Version 1.16.20002.0 on 12/8/20. I have Bedrock/ Windows 10 edition.