How to define day/night reading mode?

A: You can setup the day/night reading mode for easier health reading of the output eBook app (after run in Android device).

Define current book day/night reading mode:

1. 1 Click icon "Config" on top menu bar;
2. 2 Select the option "Display config";
3. 3 You would see the day/night config option, and then setup their font and background color.

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