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Close All Subgroups
closes all groups in a selection.
Menu Items: Close Unselected Cells Open All Subgroups Open/Close Group
Front End Tokens: SelectionCloseAllGroups
Cell ▶ Grouping ▶ Close All Subgroups Cell ▶ Grouping ▶ Close All Subgroups
(Windows); 
(Macintosh); 
(Linux).