DJI Pro controller....all updated. I hover, but cannot "drag" a green box around a subject on the DJI Fly screen for some reason. I can go from "DJI Fly Control">to Control Settings> to Subject Scanning.....then I have Focus track. Not a problem; however for some reason, cannot drag or find out how to drag a green box around the subject from the DJI Fly screen. WHY? Thanks folks.....