Prefab Icons overlapping glitch

When looking at the prefabs in the project window, it shows a stack of every prefab previously opened, as if the camera that renders the previews has no clear flags.
You can see here: behind the prefab is a giant jumbled stack of previous prefabs that Ive looked at. The prefabs are totally fine when opened, so its an issue with the editor.

Here’s what it looks like when I open the Defibrillator prefab for instance (totally fine when opened):

It might be helpful to know that when I use the Tile Palette window, it also has a weird similar issue that looks like a clear flag issue, creating a snaking when dragging the view around- but this clears itself every few seconds (reverts to normal). Bringing this up because while it isnt an issue, perhaps it gives a clue as to whats going on with the editor.

Im using unity 2021.3.15f1, tried upgrading but it didnt do anything. Any idea what’s happened here? Im thinking its a bug but it could also be something that I did wrong on my end. Its a big nuisance so any help appreciated! (and sorry if this is in the wrong place)

9573250--1354858--upload_2024-1-10_16-1-54.png

Here’s one possibility:

tofu fonts and / or blank buttons:

I read recently this can be fixed by specifying OpenGLCore in the preferences, as follows:

Thanks, but it didnt solve this issue