Use the Options menu on the main or the optional view window as
  follows:

  Action             Function
  ------             --------

  Views...           Displays one or more of the
                     debugger's optional views:

                        Breakpoint View
                        Monitor View
                        Instruction View
                        Threads View
                       Register View

  .!Track Language     Notify you when the debugger
  .!   Changes         enters a module written in
  .!                   a different source language
  .!                   than the previous module.

  Show Message       Display a dotted line between
     Separators      debugger messages and commands.

  Customize          Adds, removes, or resequences
     Buttons...      a push button in the push-button view.
                     Also changes a button's label or
                     the debugger command associated with
                     a button.

  Save Options       Saves the current definitions of the
                     debugger user-interface options for use
                     in subsequent debugger sessions.

  Restore Default    Copies and saves the default definitions
      Options        of the the debugger user-interface options
                     for use in subsequent debugger sessions.

  Edit Options File  Loads and displays local debugger resource
                     file DECW$USER_DEFAULTS:VMSDEBUG.DAT in the
                     Debug Editor for review and modification.