Nikon Z 9 Reference Manual page 839

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Modeling Illumination
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Pressing the control to which [Preview] has been assigned using Custom
Setting f2 [Custom controls (shooting)] causes CLS-compatible flash units
to emit a modeling flash.
•
This feature can be used with Advanced Wireless Lighting to preview the
total lighting effect achieved with multiple flash units.
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The effects of shadows cast by the flash are best observed directly rather
than in the shooting display.
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Modeling illumination can be turned off by selecting [OFF] for Custom
Setting e5 [Modeling flash].
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Studio Strobe Lighting
To adjust the color and brightness of the view through the lens so that shots
are easier to frame, select [Adjust for ease of viewing] for Custom Setting
d8 [View mode (photo Lv)].
Compatible Flash Units
839