You can remove unnecessary items from the Ditaval view.
      To delete a Ditaval file or folder:
      
      - 
            In the Ditaval view, locate the file or folder to delete.
            
If necessary, expand the Ditaval folders. 
          - Right-click the Ditaval file or folder to delete and select
               Delete.
The Delete Ditaval dialog appears, asking you to
               confirm.
 - Click OK.
The file or folder is deleted.