Orpington can be the biggest bullies!! I had a hen that HATED the fact that I got new chickens and she went crazy on them! She got so bad to the point of pulling out my Ameraucana’s tail completely and I ended up having to treat her for 3 1/2 weeks until she had it completely back. My Orpington ended going in a separate pen while the others would roam around the coop and then I finally let her out with the others and she was alright, but still pecked them but not as severe. She ended up showing some weird respiratory signs so she got separated and then a few weeks after treating her, she died. I will never have an Orpington again even though she laid the best eggs.
Also I would find stuff and ideas to put in the coop like a couple swings, different treat ideas and maybe even some chicken toys you can find. Chickens love things like mirrors(at least mine do) and also maybe get one of those little colorful piano keyboard things that you use for kids. I also think sand would be a good option since it would be easy to take care of and I have also read a lot of good stuff on it and even use it for my chicken’s dust bathing area since it helps keep bugs away