You can set to auto mode via the settings button on the centre screen. Then when the lights come on will automatically dim the display. If they come on when it is dusk & you don't want things so dark, then give the stalk in the binnacle one twist clockwise, and light is restored.
Next time you drive at night, the auto facility will still be in place.
There is one thing, there looks to be an intermediate display level as you twist the stalk back to dim mode, and it looks more user friendly, but not available though.
Alex