In reviewing the documentation I encountered difficulty in locating a method to disable a toolbar group.
I attempted to utilize instance.UI.disableElements(['redactionToolGroupButton']);, but I observed that it hides the element from the DOM rather than making it disable. Is there a means to retain the button within the toolbar in a disabled state?
In general if the tool is not being used it would be hidden from the UI as there would be no use-case for using it.
One option would be to disable it via JavaScript:
i.e.