Thanks, Michael, I appreciate the info.
Now I do have the joystick set to move AF but it falls a sleep. I was a track meet today testing and getting accustomed to the new camera. I shot some action with the sensor on the far side activated. Minutes later as another subject moved into action I wanted to give a quick push on the JS to bring the AF back to center to start shooting.
As I began to shoot I realized AF never returned to center because it was asleep and I was stuck quickly fumbling to wake it up and reset it on the fly as runners sped toward me.
I'll step away from the computer and will examine my camera settings. Nice of you to help, I'll check out your guide.