After fiddling around with version 3 I am getting used to th new UI.
For sure a bit to learn, espacially using the potential of the left blocs structure.
Very happy to see tabs and accordeons now, only styling them is not yet very convenient (tabs - the grey border and how to style an active tab).
Hope this will be easier in near future.
The fact, that the colour of hamburgers can not be changed is also an unexpacted surprise as the subclass is still there, but without any effect.
Hoping the best after @Norm had a little rest and gets new ernergy.