How to prevent my players from drawing on the map?

Dumb question, but any help would be appriciated ^^

I just tell them to stop.  Then again I'm the DM in my campaign so they know better then to risk me bumping CR of their next couple of encounters.

If you are the owner of the game, and you have players drawing dicks on your maps, tell them to stop, or they get booted from the game.  If they cant control themselves, you didn't want them in your game anyway, so boot away. If you are a player in the game, ask them to stop, and if they don't, tell the DM that you cant play with a bunch of juveniles, and quit that game. There are enough decent people to game with that you do not need to waste your time with the rejects.

In a game created on a free account, it is a social situation and you can mainly just ask Players not to draw, or erase any unwanted drawings (select and delete). Wiki docs for clearing drawings, <a href="https://wiki.roll20.net/Drawing_Tools#Clearing_Dra" rel="nofollow">https://wiki.roll20.net/Drawing_Tools#Clearing_Dra</a>... GM can move individual players, or the Players Ribbon, to a splash page or scribble page that is intended for drawing (to get it out of their system and keep it off your maps). Wiki, <a href="https://wiki.roll20.net/Page_Toolbar#Switching_Bet" rel="nofollow">https://wiki.roll20.net/Page_Toolbar#Switching_Bet</a>... With a Pro account you can use a community-created API script called Dry Erase by Arcane Scriptomancer The Aaron, to label and limit drawings. Forum link, <a href="https://app.roll20.net/forum/post/2852459/script-d" rel="nofollow">https://app.roll20.net/forum/post/2852459/script-d</a>...