Is it just me or do others notice some color modes missing? I no longer see the Art color mode. I'm also having trouble changing the values in the style mode. What's going on?

I think I have the same problem as you. The app used to have several color modes like Beach, Water and etc but now it is very limited. There are also a bunch called Film-(A through I)

DJI ken thinks that it's an oversight that "ART" is missing. I read this in another thread somewhere? It is definitely the upgrade that changed the settings. I'm not sure if you can go back to the old firmware, not sure of the safety fixes.