For the record. you can see "Internal Bookmark Folder" mentioned in the button maker dropdown - but choosing that always adds a ", 1" which would make it show the root folder (all bookmarks) Or you can see it used (with Include rather than Submenu) in the default menu file standard_menu.ini. The "32" seems strange there unless it's not actually your first folder - by default I think Trash is first, but on my system I dragged Trash to the end years ago.