Nikon D850 Menu Manual page 91

Option Description
Choose whether the camera gives priority to exposure
time or interval timing in exposure modes P and A. Select
On to ensure frames are taken at the chosen interval, Off
to ensure that frames are correctly exposed. If On is
selected, be sure the Minimum shutter speed chosen
for ISO sensitivity settings (0 49) > Auto ISO
Interval
priority sensitivity control in the photo shooting menu is faster
than the interval. You should also focus using manual
focus or, if you are using autofocus, choose Release for
Custom Setting a1 (AF-C priority selection, 0 105) or
Custom Setting a2 (AF-S priority selection, 0 106)
according to whether AF-C or AF-S is selected.
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Menu Guide