This is all feeling a bit "passing notes in class"...
You write a note and start to pass it to a friend, when the teacher sees you and says "Alan! Stop passing notes and pay attention to the blackboard." So you face forward and the teacher turns around, after which you start passing the note again. The teacher quickly looks over his shoulder and catches you trying to pass the note again.
The point is - PAY ATTENTION AND STOP PASSING NOTES!
In other words - pay attention to the road and stop fidgeting with things while driving. Need to change your navigation? Use voice prompts "Navigate to Best Buy on Main Street" or "Take me home" or "Navigate to 123 Main Street, Anytown"
Just because people have FSDS or AP does not mean the car is autonomous - it requires the driver to pay attention and intervene if necessary.
"But, but, but, I'm driving on an empty road, there's no danger, so why can't I mess around however I want?" Aside from the obvious, car mistakenly decides the lane swerved right into that tree/barricade on the shoulder, how does the car know you're alone on a road? It can only see so far in front of you, and only so far to the sides and back of you, so its operating in a most restrictive manner.
"But, but, but, isn't FSDS/AP supposed to be safer than a human? Wouldn't it be safer for me to mess with whatever I want while it's operating instead of trying to do that while I'm driving manually?" A very valid argument, and I'd totally agree if it wasn't for two things: 1) FSDS/AP are L2 driver assist features, and require constant vigilance while using. Don't get complacent. 2) Misuse of the system has lead to increased driver monitoring due to internal decisions from Tesla and outside pressure from regulators like NHTSA.
So be a good lamb, and stop messing with things while using ADAS features.
PS - Any L2 ADAS feature from any mfg that includes driver eye monitoring will scream at you for messing with things. Try playing with your touchscreen for 10+ seconds while using Blue Cruise or Super Cruise, et al.