Huawei P20 User Manual page 133

Adjust the screen brightness: From Brightness, select the check box next to Automatic. When
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this option is enabled, your device will automatically adjust the screen brightness based on the
ambient brightness. To manually adjust the brightness, drag the brightness slider, or swipe down on
the status bar to open the notification panel and access the brightness settings.
Enable automatic screen rotation: Enable Auto-rotate screen. Alternatively, swipe down from
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the status bar to open the notification panel, and then enable
Sound and Display
.
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