I’ve changed-up how it works. I had this epiphany that I could hide sections that are closed. Or maybe not such an epiphany. So you put the macro at the top of your section tiddler, and then you can close all/open all. Clicking on a TOC item opens that item. There is a checkbox that lets you hide closed items, so you can focus on only certain sections.
Use with care. Make backups, etc.