Yes, I agree with DiapDealer here. It is just not useful enough. If you want that feature, create two different custom_preview_style.css files one with that block of css and one without that (under two different names) and use a os system level shortcut to run a bat file (or bash script) to copy the one you want to custom_preview_style.css. You can do this anytime Sigil is open without hurting anything as that file is read only from Sigil's perspective and is included each time Preview is refreshed.
Much like how I manually change to and from dark mode using macOS Settings now. Sigil options are not needed for this.
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