Created attachment 178970 [details]
About dialog in Dark Mode
The attachment shows that the links in About dialog are very dark. For comparison, one could look how hyperlinks look in browsers on pages that honor dark mode (e.g., https://docs.microsoft.com/en-us/office/vba/language/reference/user-interface-help/dictionary-object in Chrome on Windows shows the links in much lighter blue on the dark background, which is clearly visible).
Heiko, possible it can be changed just in LO's Options dialog inside you Dark mode color set?
Set to New
By default, the colors are 1939955/1D99F3 and 10181046/9B59B6 (both DEC/HEX) for visited and unvisited links. And these colors are brighter than in the screen shot. Please check in safe mode.
Wait a second, it's not the application colors but the colors we read from the system.
Colors set for 'Unvisited links' and 'Visited links' in the "Application Colors" panel with the LibreOffice Dark theme are applied to document canvas, and will toggle for example taking Writer between Normal and Web view modes.
But the hyperlinks in the UI panels like the Help -> About dialog do not respond, though they are valid URI that can be followed. They seem to have a different mechanism for assigning their color--which comes from elsewhere (os/DE likely).
*** Bug 149335 has been marked as a duplicate of this bug. ***