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Calibre seems to be using its own theme and I have seen several guides get it to use either the system theme or its own dark theme, such as, most recently, this one:
https://dev.to/lobo_tuerto/how-to-enabl … linux-204b
But they seem outdated because they don't work for me. Does anyone know how to do this?
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I'm using XFCE desktop and use kvantum to set the theme for Calibre.
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