fender guy, I've been able to change quite a few colors in x1 when I used it, have you gone in and tried any color changes, not just a couple, like going through several menus changing a few things.

I had the whole background blue and my track fonts yellow and orange for busses,
even more than that, there are quite a few things that you can change.
just because a few of the fan favorites don't work doesn't mean the others don't, give it try.

Ive noticed you can change quite a few in Console view but Track View was limited for me.

Make sure you back all the way out and then come back in to X1 for changes to take effect so you can see what did and didn't change.