Is it possible to change multiple waypoint symbols at once by selecting a group? I can do that in the Windows version but cannot figure out how to do it in the Mac version.

In the left column, select a waypoint name in the contents of the chosen list. Shift-click (for consecutive selection) or command-click (for non-consecutive selection) additional waypoint name(s). Of course, select-all would work, too. Dbl-click any of the selected waypoint names. In the multiple waypoints info box, select a new symbol.

Thank you Daknudsen.  I will give that a try.