1. Open the file and enter the reading page;
2. Click More icon 
on the button;
3. You can choose different theme colors: Day Mode, Night Mode, Reading Mode under Page Setting.
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How to Customize Themes?
1. Open the file and enter the reading page;
2. Click More icon on the button;
3. You can choose different theme colors: Day Mode, Night Mode, Reading Mode under Page Setting.
