Use the Filters menu to display only objects of a
  particular class. You can filter only one object class
  at a time. To change the filter, choose a new class
  from the Filters menu.

  Setting a filter does not affect the current display,
  but when you next expand a directory, you see only
  object entries whose class matches the filter. Note
  that soft links and directories still appear because
  only object entries can be filtered out.

  To reset the filter so that you can again view all
  object entries, choose the asterisk(*) from the Filters
  menu.