As long as there's ample hiding spots, I leave them be once the littles prove to me that they know where their safe zone is. Which it sounds like they do.
I also find that for chicks in particular, having vertical space (clutter that allows for vertical escape) helps, as younger birds are more agile than older ones. Note that I have food and the chick's water on top of this jungle gym - older birds are less inclined to go up there but the chicks (in back left corner) can dart up, get a drink, and see any adults coming much more easily than on the ground.
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