The heap analyzer allows you to save (or remove) the display of a
  segment type in the Memory Map by doing one of the following:

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

   -  Selecting the Save or Remove menu item and clicking the Apply
      button in the Views-and-Types display.

  This feature can be useful when you need to improve heap analyzer
  performance by discarding information on unimportant segments.  It is
  also useful when you need to discard all information before a point in
  time, so you can perform a series of actions and see the display
  resulting from them.

  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.