Immutable is the right word. I was trying to “fix” the new dark mode in Calibre 4 (it’s bad and clearly not tested — the default hyperlink colors are nearly unr

Immutable is the right word. I was trying to “fix” the new dark mode in Calibre 4 (it’s bad and clearly not tested — the default hyperlink colors are nearly unreadable and the hover-over color in the library menu are impossible to read), and while I could fix the CSS in some parts (which was the dev’s dismissive answer to the bug report on how dark mode is legitimately broken), other parts can’t be fixed without using overly-complex plugins (that have to apply overrides every time you start the app) or ripping apart the source in a way that is not worth the effort. My solution was to use a different Mac app to “force” Calibre to ignore the systemwide setting and use its light mode instead.