To change the screen mode:
Open a document from your library.
Tap the three-dot menu in the top-right corner.
Select Appearance.
Click on Player, tap the current display setting.
Choose between:
Light
Dark
Match Device to automatically follow your device settings
Additional Appearance Options Inside the Appearance menu:
Reader Mode
Font style
Font size
Bold text
Cursor color
Tip
Using Dark Mode can help reduce eye strain during nighttime reading or long listening sessions.