KB Categories and Knowledgebase - no subpanels showing

Reading older comments on here I expected to see a subpanel for KB Categories below a Knowledgebase detail view where I could assign and KBA to a KB category.

I cannot see anything in the Studio to affect this

Thanks in advance

Quick Update
The system is on 7.11.8 and has been updated over a number of releases

A fresh install shows the sub panel OK