I would still say to invest (or invent!) additional feeders and waterers and split the floors, with something they can’t see through. Or at the very least, a section of solid floor that the one can escape under/on top of to be out of sight of the other.
They don’t have to be fancy, my quail currently have a yogurt container with water and a shallow cat dish for food, in addition to a regular feeder and waterer, just to make sure everyone can access and there’s resource guarding stupidity going on.
im sure quail are the same way as other poultry, some individuals just don’t like others. People too.

Have they always been enemies or is this a new development?
You might have better luck with those little straw hut things they make for small critters, they don’t take up a ton of space. Or cut the ends off a Kleenex box and shove that in there. Lol. The possibilities are endless. xD