Huawei P20 User Manual page 134

Adjust the colour temperature: Touch Colour mode & temperature > Colour & eye comfort.
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Select a preset option (Default, Warm, or Cold). Alternatively, touch or drag the slider to manually
adjust the colour temperature. The colour temperature cannot be changed when Eye comfort is
enabled.
Automatically adjust the screen resolution: Touch Screen resolution and enable Smart
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resolution. The system will automatically adjust the screen resolution to reduce power
consumption.
Enable the screensaver: Touch Screen saver and enable Screen saver to configure the Picture
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source and Duration. Your Phone will display a slideshow of your photos when the battery is
charging and your Phone enters standby mode.
Sound and Display
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