The heap analyzer allows you to expand (or collapse) the display of a
  segment type contained inside the display of other segment types in the
  Memory Map by doing one of the following:

   -  Toggling the Expand toggle button and clicking the Apply button in
      the Views-and-Types Display.

   -  Selecting the Expand or Collapse menu item and clicking the Apply
      button in the Views-and-Types Display.

  This feature can be useful when you need a more or less detailed
  picture of an area in the Memory Map.

  For information on other heap analyzer screen locations and pop-up
  menus, click the 'On Context' menu item in the heap analyzer Help menu,
  then click the location of interest.

  For information on using the heap analyzer, see the 'On Window' menu
  item in the heap analyzer Help menu.