Roll-back and feedback on the new UX

[jakolehm]

@a.bauer

Mixed tabs:
This increases the likelines of applying changes to the wrong cluster. You should at least consider an optional automatic grouping of the tabs based on the clusters.

We have been thinking this quite a bit in the past weeks How do you feel about the following idea where we only show tabs that are related to the “drilled-down” scope of the Navigator: