Unifi U7-Lite Unable to set channels manually

I have added an AP to my network. All my other APs are U6, but I didn’t want to stay the same or go backwards so I added a U7-Lite. I like to set all my channels manual and not use the AI Optimization. Problem is I have the AI turned off, and I still CANNOT set the channels manually on the U7. Save changes is greyed out. Actually I can’t change any settings on it at all.

Any ideas? Thx