CITROEN Grand C4 PICASSO Owner's Handbook Manual page 58

Monitoring
Black screen (black panel)
instrument panel to be switched off for night
driving.
The instrument panel remains on with the
vehicle speed, the gear selected in an
electronic or automatic gearbox, cruise control
or speed limiter information, if in use, and the
low fuel alerts as appropriate.
If there is an alert or a change in a function
or to a setting, the black panel mode is
interrupted.
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Using the steering mounted control:
With the vehicle lighting on, press this
button again to activate the black panel.
Press this button again to deactivate it.
Black screen (touch screen tablet)
Press on the " Configuration " menu.
Press the " Turn off screen" button. The
screen in the touch screen tablet goes off.
Press the screen again (anywhere on its
surface) to switch it on again.