In the Courses & Groups drop-down menu, there is a link: "View All or Customize (#)". This allows one to choose which courses appear in this list. However, there doesn't appear to be the same functionality for Groups. It only has the link "View All Groups (#)", which doesn't seem to allow one to choose which Groups are shown, so they are all shown.
Is there a way to filter the Groups list so they don't all show?