Use the Break menu on the main window as follows:

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

  On Exception     Breaks on any exception signaled
                   during program execution.

  Activate All     Activates all breakpoints that have
                   not been canceled, causing the debugger
                   to suspend program execution when a
                   breakpoint is reached.

  Deactivate All   Deactivates all breakpoints, causing
                   the debugger to ignore them during
                   program execution.

  Cancel All       Removes all breakpoints from the
                   debugger's database.  You cannot
                   reactivate these breakpoints without
                   explicitly setting them first.

  Set...           Displays the Set/Nodify Breakpoint
                   dialog box to set an individual breakpoint
                   (see Additional Topics).