Curious, where-in general- are you located? Climate can have some impact on space, etc.
my chickens live in their run, but it is covered and mostly protected from the worst winds. They love to be let out, usually in the fall and winter as the garden winds down, or early spring. They have roosts, and visual disruptions in the run, so they can get away from each other if needed. There are multiple water and feed spots, so bullying is minimal to nonexistent (still pecking order of course).
In the end, it is always the responsibility of the owner of the livestock or pets to contain/control their animals. So, assuming it was ok for your animals to frolic outside of your property was a mistake. However, now you know. Some of our chickens figured out how to fly out of our run, and sometimes strayed to neighbors property. While they didn’t mind the first few times it happened, we knew we needed to contain the birds, otherwise it would become an issue. So, we erected inexpensive bird netting several feet above the fence and that has kept them inside the run.
good luck.