The map HUD in Neokyo is almost unreadable because the black elevation color vanishes against the location map (see 1st image). The simple solution is to change the color of the elevation profile to a light color/contrasting color so it shows against the dark background (see 2nd image). This would allow everyone to easily see the rolling ups and downs of the urban terrain!
I mentioned that over a year ago.
The elevation chart that we want - General Discussion - Zwift Forums
My suggestion was to put a 1 pixel border around the elevation graph.
I understand that the promised update to the mini-map is still in the works so you’ll probably get some kind of change soon. Whether that helps with this issue on a dark map remains to be seen but hopefully @evan-zwift is taking notes.
You can see a pre-release sample of that change in this article from May.