How can I set the unit to Pro mode? It seems to be set in Std and there seems to be no way to change it. Does anyone have a tip? I'm pretty frustrated that there's nothing on this in the user guide, or online, and there seems to be no phone number to call for assistance. It's also annoying that when I powered it up and began to follow the instructions, what I was seeing on screen didn't match the user guide. Leviton used to have a better reputation for quality.