What if Huawei nova8seapp turns gray?

Huawei nova8seapp turns gray. Do the following:

1. Click to close the screen time management of Huawei nova8seapp and restore the color screen.

2. Huawei nova8seapp turns to gray mode, that is, the e-book module is turned on, and the color screen can be adjusted back after it is turned off.

3. Enter Huawei nova8seapp settings, click the sleep time/stop time in the healthy mobile phone, turn off the screen graying switch, and restore the color screen.