How Do I Move a Bookmark Folder To a New Index Position?

Using Mac Pro Late 2013 Mojarve 10.14.3 Safari 12.0.3
Attempting to move a folder by “ drag and drop ” to a new position in Folder Index table using “ Edit Bookmarks ”. Positioning transferring folder icon to required position, adds the folder to the contents of the folder immediately above and does not locate as an individual folder in line with other listed folders. Indicator reflecting travel of folder to new location, will not extend to left under other folder icons, only directly below contents of the folder above. Thanks, your advice appreciated.
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David Cotterell