Have you tried the new Dark Interface from EMUI 9?

Applicable products:

HUAWEI Mate 20 Pro,    HUAWEI Mate 20 X,    

Start With
Mate 20 Pro, Mate 20 RS and Mate 20 X feature large capacity batteries, giving you an excellent autonomy. But you can try to extend your battery's life even more with the new EMUI 9 Dark Interface.
Follow these steps
For your information
The dark interface turns the background in the settings menu and the notifications shade to black, extending your battery life.

The OLED display works by turning on and off individual pixels, so a darker interface requires less pixels to be lighten up and consumes less energy.

Darker colours also cause less strain on the eyes and protects your vision.
Instructions
To activate the Dark Interface, go to Settings, tap Battery and press Darken interface colours.

Now most of the interface turns black, giving your phone a cool and unique look, while saving power and protecting your eyes.
Eye comfort mode
For late night browsing and gaming sessions you can also use the Eye comfort mode, which filters out the blue light to reduce eye strain. Activate it from Settings> Display> Colour & Eye comfort.

Tap Eye comfort to activate this function instantly or you can enable it for a set period of time each day.
You can also activate this mode from the notification bar. Slide it down and press to enable it.
Done
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