Hello Thomas,
the thing you are looking for called Navigation Bar in HippoEDIT.
Hierarchy Bar allows you only navigation in functions (scopes) in hierarchy. It is mostly used for languages where hierarchy deepness can be very big. For example in HTML.
Navigation Bar can be used mostly in any syntax. It depends (configured) on
labels definitions from syntax schema. If it was not shown for some syntax, probably labels are not defined for it (I have not enough time to add them in all schemas). In this case you can add them by yourself and share it

And I would update installation.
It is also planned a
Function list in form of tree as one of side panels, but this would come in new versions onf HippoEDIT.
Best regards,
Alex.