Nikon Z 9 Reference Manual page 543

Option
[Interval priority]
[Focus before
each shot]
•
[ON]: Enable interval priority to ensure that frames
shot in modes P and A are taken at the chosen
interval.
- Flash photography is disabled.
- Release priority is enabled regardless of the options
selected for Custom Settings a1 [AF-C priority
selection] and a2 [AF-S priority selection].
- If [ON] is selected for [ISO sensitivity settings] >
[Auto ISO sensitivity control] and the time chosen
for [Minimum shutter speed] is longer than the
interval, the time selected for the interval will take
priority over the selected shutter speed.
•
[OFF]: Disable interval priority to ensure that photos
are correctly exposed.
If [ON] is selected, the camera will focus between shots.
Select [OFF] to focus at a fixed distance.
C The Photo Shooting Menu: Shooting Options
Description
543