How can I direct heat from a fire pit table?
Reflection of radiant heat is what you would be after. If you could magically hang it, one of the best would be a metal surface above the fire reflecting heat back down to everyone. Using an upside down cone or pyramid shape, with the middle point centered over the burner and the angles set so that the surfaces would reflect the fire and heat (radiant heat and the light of the fire follow the same path) right at the seating area. A hanging flat surface would go a long way too, such as a hung metal plate or even a tarp (don't start a fire). I'm not sure that this is that feasible. I don't think much else would help since the heat is mostly radiant and any that is in the form of hot air will just rise away if not in some sort of enclosed structure