Nikon Z 7II User Manual page 817

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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] causes CLS-compatible flash units
to emit a modeling flash.
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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 [Off] for Custom Setting d9 [Apply
settings to live view].
Compatible Flash Units
700