Adjust overall size, or proportions? For overall size (for instance, if you have two characters with the same proportions, but one is 5'1" and one is 6'4"), then the Scale dial (overall scale, not ScaleX, ScaleY, or ScaleZ) in the body is the way to go. If you want to change proportions, the StretchArms and StretchLegs dials scale body parts.