One looking for a commission and couple of boat payments?
Mine are out 24/7 but I’ve sent them from time to time to a very good trainer who puts them in stalls most of the day (although I got lucky on the last two occasions and they got outdoor paddocks). The first few days they are a bit ansty as they are doing something new (not working as hard) and they have excess energy. But they settle relatively quickly. If yours is not settling then the first thing is to get them in a part of the new venue where they can burn off energy. That way you don’t have to worry about a “diet” just monitor the feed/activity ratio. Of course that may be a problem in any place with 200 head onboard as that number means a very “industrial” program of feeding, turnout, etc. “Industrial” does not necessarily equal “poor” but may be inappropriate for your horse NOW. You need to talk to the BM but be aware that you are ONE of TWO HUNDRED and may not get the very personal answer you 'd like to have.
Work is one the best therapies you can apply to a horse to improve behavior. A man or a horse without a job is almost always going to be a behavioral problem!
Good luck going forward.
G.