Change Hierarchy Column Name in a Matrix

Thank you everyone for your suggested worarounds. And, I especially appreciate the confirmation from Anonymous that the feature does not exist.

The main reason I can't just chuck a rectangle over it is because my visuals are transparent, and that would horribly clash with the background. Furthermore, I re-use the Hierarchy in numerous reports. Thus, the context changes from report to report, and renaming it to something more descriptive for one report would break it for others.

The only real workaround seems to ditch hierarchies and just manually load the levels row by row into your report. Then you have complete control over the title.

It's not a big deal, I just wish I knew this sooner before wasting a bunch of time on it. It's these little things that are frustrating and make PowerBI development into a nightmare. Oh well, you live and learn.