On the reading screen, touch the middle of the screen to display the menu bar at the bottom. Touch "" to enable/disable Nighttime and Eye protection, adjust the brightness, or set the reading background. The detailed steps are shown below:

1. Touch Nighttime to enable or disable the Nighttime feature. When it is enabled, the reading screen will be dimmed to allow for more comfortable reading at night.
2. Touch Eye protection to enable or disable the Eye protection feature. When it is enabled, all HUAWEI Books screens will take on a slight yellow tint to reduce blue light, and better protect your eyes.
3. Drag the slider on the .

Drag the slider on the brightness bar to increase or decrease the reading screen brightness. You can also touch SYSTEM to have the brightness of the reading screen aligned with that of the phone system.

4. You can change the background color and background image, and apply a background color and background image, for example, white and forest, or green and forest. The selected background color and background image will display in overlay mode. When you select "" , the background that comes with the e-book will be used, and the background image can't be changed.