Never seen one on any car where there is an adjustment on the wiper
transmission as to the sweep area.  You can adjust where the blade
starts, ends and parks all at the same time by removing the wiper arm
and then just reseating it.  The arm socket has teeth that are a few
degrees apart.  But normally this is only necessary if the arm has been
removed and not reseated where it belongs.

If that doesn't do it, then it;s probably either live with it or
install a new transmission.