Ducati MULTISTRADA 1260S Owner's Manual page 170

Select NIGHT (night more) to permanently set display
black background for dimmed visibility -
recommended in case of poor ambient light and/or at
night.
Select AUTO (automatic mode) to automatically
adjust background colour according to ambient light
(detected by a sensor). If the external lighting is
strong, the display will switch to white background; if
the external lighting is poor, the display will switch to
black background ".
Note
In case of battery off, when the voltage is
restored and upon next Key-On, back lighting will
always be set on "AUTO" mode.
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