This is my brooder & integration write up (you can skip the brooder part) -
https://www.backyardchickens.com/articles/short-on-thyme-recycle-a-prefab-brooder.73985/ I began letting my chicks mingle with the adults at 2 weeks and they were in the coop and roosting by 6 weeks.
If you don't having obstacles to break up the space and allow chicks to get away from adults, I'd suggest adding some. It can be as simple as patio furniture, wood pallets leaning on a fence, tree stumps, other outdoor "junk" (as long as it's chicken safe.)
This is a diagram of my run. Note that most of the items aren't up against walls, which gives chicks options to get away in case a hen tries to corner them. The items that are up against a wall have openings in 2 different directions, so once again, the chicks can't get cornered. I also have multiple feeders in the morning, as that's when they'll most likely fight for food.
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