I think this may be down to Slobadan's dry sense fo humour.
It may be a bug. Are you on a Mac using LR maximized on the screen? I read about a similar issue and the panel reappears if you minimize or resize LR (going out of maximize)
P.S. I am using LR Classic on Mac, latest everything (software-wise). 2019 27” iMac 5K
Latest everything for you is meaningless. When (if) you're ready for actual help here, and you can provide specifics, post.
MacOS Monterey, version 12.1
Which isn't the latest version for one...
It just got updated overnight (it is on automatic updates, so I assumed yesterday it was the latest.)
Another problem I have noticed is that randomly when checking or unchecking a mask in the mask panel, Lr freezes and I have to force quit and restart it.This happens on a Mac Pro 2013 and a Mac Pro 2019 both on Monterey 12.2.1 and Lr 11.2