I can only describe this problem by reference to the anonymised project you already have a copy of.
Take a look at the default diagram which is the component diagram which, in the anon version, is called:
telev l3l-bladd-bloo anus_g - ri-jaw_to Myrt Stena
It contains a series of concentric ovals.
Click on the inner cyan “band” and press enter. We have 3 tabs for “General”, “Diagrams” and "References"
which is what I expect (and need)
Click on the outer cyan band and press enter. Only one tab - “General”.
Why? and how do I fix?