I don't seem to have that event, is it in a plug-in?
You may not be using the most recent version of GB Studio? It's a new event that is not currently listed in the GBS docs.
I'm using GBStudio 3.2.
I think there is a plugin that will help you change the collision bounding box in GBS3.2. If there are any other issues, its best to ask questions on the GBS discord.
