Do you mean for the UI or for messages? For the UI, it should use your GTK3 theme. For messages, there are settings in the preferences. You'll find them quickly.
signature.asc
Description: PGP signature
Do you mean for the UI or for messages? For the UI, it should use your GTK3 theme. For messages, there are settings in the preferences. You'll find them quickly.
signature.asc
Description: PGP signature