A markdown outline sidebar plugin for Joplin

I upgraded to Joplin 1.7.11 (prod, darwin) and also upgraded to v1.0.11 of this plugin. I am not sure if this is a plugin bug or an app bug, but I had this plugin moved to the bottom of the note list column. When I upgraded it moved back to the far right, and now I have a blank application panel that I don't know how to get rid of.

Has anyone else seen that?

(Note, i have a dozen plugins installed, so might not have anything to do with this one! just happened to be this panel that turned blank).