Hi:
Up until the latest update (2025) for After Effects. I was able to change my Theme UI Color. This link shows a video of how you used to able to change the Theme UI Color: (Mod note: Link removed)
I contacted an Adobe Agent and he said several changes were included in this latest update of After Effects. He said to file a feature request here in hopes of getting that feature back again. The After Effects Version I am using is: 25.0.0 (Build 53) and I am running it on a PC with a Windows 11. This may not seem like a big issue to some people but it's something I got used to as part of my workflow. If you could bring this feature back it would greatly be appreciated!
Mod note: Please do not condone the use of internal engineering tools like Console. The link showing how to change engineering settings in the UI has been removed. The text was also modified. Thanks.