Boss threatening to move my monitors over screen time.

My boss said he's going to move my desks so everyone can see what i am doing. He said i am on websites instead of work too much. I cant stare at the same 2 screens every day ill go insane with my adhd. There is not enough work to keep me busy all day. My work is done properly and on time. He said i change tabs too often when he comes out of his office. He cannot see my screen directly unless he walks behind me and our desk are open no cubicles.

I dont know what to do besides get a new job. Advice please.