New to this, but as a special ed behavior teacher, I am looking to possibly utilize this to help my students collaborate, but I have found that they are drawing, deleting, and doing everything but what they should be on the document. (Thinking about making a layer where they can only interact with their space?) Is there a way to limit what they can move/interact with? I have been watching tutorials and playing around, but have not found a way yet, and help would be great!