Nikon D810 - Manual (Page 331)

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When AF-S is selected for viewfinder photography (0 87), this
option controls whether photographs can be taken only when
the camera is in focus (focus priority) or whenever the shutter-
release button is pressed (release priority).
Regardless of the option selected, if the in-focus indicator (I) is
displayed when AF-S is selected for autofocus mode, focus will
lock while the shutter-release button is pressed halfway. Focus
lock continues until the shutter is released.
a2: AF-S Priority Selection
G
button ➜ A Custom Settings menu
Option Description
G
Release
Photos can be taken whenever the shutter-release
button is pressed.
F
Focus
Photos can only be taken when the in-focus indicator
(I) is displayed.