Challah bread -- too crusty?
I've found that the crustiness of my challah is dependent on how long I leave it in the oven... If you want it less crusty I'd say you should just try taking it out a bit earlier. You can also try turning the oven temperature slightly lower.

(I bake my challah in tins, and find that the bottoms of the challah are often too soft when the tops are just the perfect crustiness, so I flip the challah and bake for another minute or 2 upside down to crust the bottom. If you're aiming for a soft crust, maybe you can also try covering the top with aluminum foil? I've never tried this though.)