Nikon D500 Getting Started Guide

The  following  options  are  available  in  Custom  Settings 

Group “a” (Autofocus).

  a1 AF-C priority selection
  a2 AF-S priority selection
  a3 Focus tracking with lock-on
  a4 3D-tracking face-detection
  a5 3D-tracking watch area
  a6 Number of focus points
  a7 Store by orientation
  a8 AF activation
  a9 Limit AF-area mode selection
a10 Autofocus mode restrictions
a11 Focus point wrap-around
a12 Focus point options
a13 Manual focus ring in AF mode