Sue explains it well.
Lots of people have different views of free range.
True free range means they have unlimited access to forage in pasture and/or forest.
I do some true free range and also use paddocks that are planted and rotated.
Once chickens are imprinted on their terrain, they won't run away like a dog or cattle will.
Initially, they need to be confined in a pen or other enclosure so they can orient themselves to their surroundings for a few days. After that, you can turn them loose and they won't venture beyond what they know. Eventually they will go beyond eyesight of their coop but they always come back home by dusk.
Having good agile roosters will eliminate many predator issues, especially the raptor variety.