Zoom used to have a strange behavior, one I'm sure they thought would be useful, but in reality was infuriating: if you moved between virtual workspaces, Zoom would minimize to a thumbnail window that followed you around to workspaces.

At some point, it went away, thankfully... but after a recent release, it turned back on, and it's been a huge pain for me. There's a bug in that the mini window follows me to the initial virtual workspace, but then doesn't follow around from there, requiring me to use the workspace tools to move it to the workspace I want, and then re-maximize it, only to have to do the whole thing again if I switch screens.

The solution turns out to be relatively simple, if incredibly unintuitive.

Zoom does NOT have a GUI setting for this, for some reason. But evidently it creates the file $HOME/.config/zoomus.conf, which is where all configuration is stored.

This file is in INI format. Find the entry enableMiniWindow, and set it to false:

enableMiniWindow=false

Restart Zoom, and you're set.