What do you mean by “dark mode”, Nando? If you mean enabling Invert colours for music on the Colours page of Preferences, in that case Dorico will show signposts using a white background with black text.
I’m not sure when this got put in… but we have a dark mode (invert colours in music) option in Dorico! As using Magnifier came with issues (everything on all screens flipped, & some hotkeys within Dorico were disabled) - this is great.