u/Icy-Preference4469

Is there an easy method to edit the map that players see?

I am hosting Tomb of Annihilation and when the players reveal a part, they can see if and how much infested this part is with zombies. I think they should not be able to see this on the map or at least only after deduction from encounters or other information only found in Can I hide the indicators or are they just part of the map and can not be edited.

I want to edit the yellow overlay over the map