Love the ability to UNDOCK the configuration window. Might just want to change the Wording in the view menu when you want to "RE-DOCK Configuration Window". It always says UNDOCK CONFIGURATION.
I haven't played around with the new UI much after this update, but I do like you changed the Font fields and change the view of disabled actions. Be sure you look at the view of this in Dark Mode as well as Light Mode in Majave.