2024.6 or higher

Theme options: Light, Dark (black background color), Automatic

 

Android Tap A (Chord Chart settings), either choose App Theme (Light, Dark, Automatic) or Song Theme for options

 

 

iOS  Tap Aa (Chord Chart settings) > Theme

 

 

 

 

 

 

 

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2023.7 or below

In song view, tap on Chord chart settings (third button from the right on the top in song view), then Colors.

You can change the color of the chord symbols and the background.