The creators use the plugin as a mere marketing tool, there is no intention to make it usable, as you can see when you look for support. They won’t allow you to put the TOC only where you want, even when they put checkboxes to make it happen. They are kidding us, and the promisse to change such an easy thing like this (checkboxes that doesn’t work) has been running for years now, with no real action taken after various updates. Patetic.