Capture Criteria" > "Motion; Choosing The Direction Of Motion - Nikon Z9 Settings Manual

"Capture Criteria" > "Motion"
To view the motion settings display, highlight [Advanced: Motion] in the auto capture settings display
and press J. This is where you'll choose the direction of motion, speed, and apparent size of subjects
that will trigger auto capture.

Choosing the Direction of Motion

Choose one or more directions; a subject moving in any of the
selected directions will trigger auto capture. Press W (Q) to display
options. Highlight directions and press J to select (M) or deselect
(U). Subjects moving in directions that are disabled (U) will be
ignored.
Press X to save changes and return to the motion settings display.
To exit to the motion settings display without saving changes, press i.
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"Capture Criteria" > "Motion"