Apply Rules Editing or Modification for Newbie

Exploring Devonthink, I made the mistake of clicking on a smart rule multiple time in the extras view. I later noticed I have the same smart rule appearing 6 times now in the Apply Tools/Apply Rules menu item. Went thru the help, scanned a book on devonthink but can find no way to remove these items? Any suggestions appreciated.

Just right- or control-click onto the smart rule in the sidebar and choose the Remove item of the contextual menu.