The colors of menus can only be changed using a Theme. Fortunately Pao has just recreated the default look of Scrivener’s UI as a Theme. Using that as a basis, the QSS Stylesheet, one of four files when your rename the scrtheme file and unzip it, has the classes that influence the menu colors. Some classes use colors named in the PAL palette file, so you might want to update that one too. But in practice you can use every RGBA color available directly inside the stylesheet.
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