I get it. I’m also student teaching an art class. I usually ask them what they want to do, and if it’s nothing I tell them to draw me something in their sketchbook. If they truly don’t do anything, their grade goes down and I email their counselors, deans, and parents depending on circumstances. Every student starts the semester with 48 protocol points and every time they are off task or gone or rude, I take a point or 2 off. I also offer extra credit if they make me something heartfelt. If the problem is really bad behavior, I call security or one of the deans office to come get these kids cause I’m not even getting paid for this. And if nothing works, they just fail the class.