That didnt work too, I click right on the left of the code but nothing happens. Thank you anyway.
All I can get is the bookmark on the window, that is helpful too but I would like to bookmark a specific line...
Well suddenly it worked now. Im not sure why, I just changed my mouse for another one.
EDIT: actually it was because I was using Drag n Drop. It seems like bookmark feature wont work in lines of code if it is on a DnD code block, so converting it to gamemaker language makes it work fine.