How can you change the theme for the W910i, the media player/ walkman part but I can change the overral theme?

I can change the theme, but when i select the walkman player. the theme does not carry on and I cant change the colour or style of the player, is there a way to do this

thanksHow can you change the theme for the W910i, the media player/ walkman part but I can change the overral theme?
You nee to go to settings, display settings, Themes.

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