Not sure where to post this, so I'll stick it here. A search didn't find this discussed anywhere, but apologies if it has been and I missed it.
What would be really nice (and I do mean really, really, really nice) for those of us who are colourblind is to allow the lines for a particular Civ to be toggled on and off in the Timeline graph by clicking on the civ in the legend.
Yes, I know I can edit the race colours to try to find something that works for me, but frankly speaking, it's very difficult to find 10 colours that work well for some of us. Every other aspect of the game I can determine ownership of something by selecting it, and reading the name of the owner. These Timeline graphs, however, have no real solution. Yes, I guess I can look at the other screens to see what numerical rank the race is in a given field, and then try to count the lines in the graph to find theirs, but that's painstaking and very error prone.
Let me tell you, it makes the decision to go to war that much more difficult when you're not sure which line in the graph is theirs.