Nikon D780 DSLR Camera (Body Only) - Manual (Page 244)

198 Shooting Settings
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Choosing a White Balance Option
Hold the Q / g ( U ) button and rotate the main command dial.
Options for the selected setting, if any, can be selected by
holding the
Q / g ( U ) button and rotating the sub-command
dial.
D Studio Flash Lighting
4 ([ Auto ]) may not produce the desired results with large studio flash
units. Use preset white balance or set white balance to 5 ([ Flash ]) and
use fine-tuning to adjust white balance.