A3: Focus Points Used; A4: Af Activation; A5: Focus Point Wrap-Around - Nikon Z 50 Reference Manual

a3: Focus Points Used

Choose the number of focus points available for manual focus-
point selection.
Option
R
All points
I
Every other
point

a4: AF Activation

Choose whether the shutter-release button can be used to focus
(Shutter/AF-ON) or if focus can only be adjusted using the
controls to which AF-ON has been assigned (AF-ON only).

a5: Focus Point Wrap-Around

Choose whether focus-point selection "wraps around" from one
edge of the display to another. If Wrap is selected, focus-point
selection will "wrap around" from top to bottom, bottom to top,
right to left, and left to right, so that, for example, pressing the 2
when a focus point at the right edge of the display is highlighted
selects the corresponding focus point at the left edge of the
display.
270 Menu Guide > A Custom Settings
G button ➜ A (Custom Settings menu)
Every focus point available in the current AF-area
mode can be selected.
The number of available focus points is reduced by
three quarters (the number of focus points available in
Wide-area AF (L) mode does not change). Use for
quick focus-point selection.
G button ➜ A (Custom Settings menu)
G button ➜ A (Custom Settings menu)
Description