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Put up a fence and put them inside their new area. These are chickens, not people. Their emotional state wont be drastically affected, at least not in ways that matter long-term.
Egg laying might slow up. There may be a bit of in-fighting as they adjust. But hey, it is what it is. You are the master of your domain.
Since thay have been accustomed to ranging, I'd give them the most area I can and I would NOT overcrowd them. If that means culling out a few to adjust for the new space, then do it.
Cleanliness will become an issue. That poop your kids are stepping in is a sign the chickens have room enough to "spread the wealth." Once they are confined, that poop will begin to accumulate - along with all the problems that brings with it. Be ready for that.
If you have a dog, add electric fence wire to the containment fence. A chicken running loose is different than one neatly presented to the canine senses behind a fence. Dogs can change too, along with the conditions your chickens are kept in.
Too, learn the Art of Wing Clipping. Formerly unfettered chickens will tend to stay that way. Sir Isaac Newton was right about that.
So you will have to force them to ground in the beginning.
I applaud your effort and good luck.