C4.5: Score Editor - no beam handles?


On page 493 of the Operation Manual it describes how to manually adjust the angle/proximity of beams by moving beam handles up and down…

_Manual adjustment of beams
For very detailed control you can manually adjust the
beam slant:

  1. Group and flip notes and adjust the settings described
    above until the beams are as close as possible to how you
    want them.
  2. Click on the corner made up by the beam and the
    A handle appears on the corner of beam and stem._

But they do not appear for me with Page Mode on or off. Is there something needed to get them to display or do they not exist in this version?