Right-click the group you want to collapse or expand and choose one of he follow:.
| 
                           
                            Use this option  | 
                        
                        
                           
                            To do this  | 
                        
                     
| 
                           
                            Collapse  | 
                        
                        
                           
                            Collapse an expanded group.  | 
                        
                     
| 
                           
                            Expand  | 
                        
                        
                           
                            Expand the next level in a group.  | 
                        
                     
| 
                           
                            Expand All  | 
                        
                        
                           
                            Expand all levels of the selected group.  |