I would like to be able to lock down a layer such as a map so I don't accidentally move it. Several times I will go to move a token not realizing that I'm on the map layer and scramble the map. I can Undo if I haven't done something else first otherwise the hours I took tweaking the published map that has a grid so it closely matches the Roll20 grid goes down the drain. (See my Stretch Point post.) This results in frustration and lost game time causing me to fervently wish for the end of the pandemic so I can return to my tabletop.