From: The Imperial Palace.
There's a "regime colouring" hotkey (5, I think), but it doesn't seem to do much when I press it. I really have trouble telling which regime has control over which territory on the main map. In my current game, hexes bordering me keep changing control between two other regimes at war with each other, and I'm at war with one but not both of those regimes, and it's hard to understand who's got what territory. I can do it by clicking on each individual hex, and then looking for the relevant dotted lines nearby, but that sure is tedious.
For a while I thought maybe the 5 hotkey was incompatible with the 6 hotkey (logistics overlay distance), but I don't think that's the issue. And while I'm on the topic, the "blue" and "green" colors on that overlay are too similar for me to distinguish. Kinda the same problem on the Report/Profile screen, too -- green quite close to blue. I can live with that, but the regime colouring thing is driving me batty. Am I missing something?