I like it less, the first proposal was better!
I find the close button much less « fluid ».
I’ve never been against grouping, but it has to be nice, you know 
So far, I’ve never seen a convincing design proposal in grouped mode.
For those who are motivated, a Docker image is being generated with the tag v4.0.2-color-picker.1:
https://hub.docker.com/repository/docker/atrovato/gladys/tags?page=1&ordering=last_updated&name=v4.0.2-color-picker.1
Philips Hue and Tasmota should work.
(I didn’t understand how to do it for Xiaomi.)
Hopefully, I will get some feedback.
Great, @AlexTrovato’s PR has been merged here: Add color picker in device in rooms dashboard box (#945) · GladysAssistant/Gladys@8a6ad94 · GitHub
A preview of the feature:
It will be included in the next release!
Thanks @AlexTrovato for the PR 
For information, the feature is available in Gladys v4.0.4 