How to delete Bookmarks Toolbar Folder

I have a Bookmarks Toolbar Folder and find it very handy.

I was creating a new bookmark folder and clicked on Edit and accidentally clicked, "Set as Bookmarks Toolbar Folder." So now I have a new BTF which has replaced the old BTF.

How do I delete the new BTF? Right clicking to give properties works, but Delete is grayed out. If I click on Edit with the new BTF selected, Delete is grayed out.

How do I delete this?

TIA