Dark theme in Libre is a great feature for greatly reducing eyestrain. However, it has some annoying quirks that are difficult to work around, making it borderline unusable (for me).
Display colors (application colors) can be problematic; I believe most should flip luminance when in dark mode, otherwise some elements of a document can be nearly or entirely impossible to see. Many do flip in dark mode, but some do not; listed below are but a few examples.
• Visited and unvisited links do not flip, and are way too dark, showing up as very dark blue over black: essentially unreadable.
• Tables by default have thin black borders which are apparent (and useful) in light mode, but this color also does not flip, so they are nearly impossible to see in dark mode.
• Background color fills do not flip, either ones set in Page Style, or locally set ones on individual sections.
• Some formatting marks are hard to see – try turning on a grid in dark mode . . .
I can see the documents with their correct colors if I go to the Print dialog, though I cannot zoom in this dialog. I can zoom in to see what’s going on better in Print Preview, but that of course is in dark mode, displaying the wrong colors.
I would love to have a toggle in the toolbar that can directly switch between display modes without having to change View and Application Colors in Options dialogs (and restart), but that probably wouldn’t be necessary if all the application colors that need to flip did, and print preview was just that, not a “dark mode” version.