@ringmaster Thanks for your reply and best wishes Roland.
@sottwell Thanks for your suggestion Susan! Be great if it were so simple but the 'pull-left' CSS needs to be targeted at only 3rd level submenus in the nav list close to the edge of the viewport...
Screenshot of desired behaviour:
and this is the way it looks as currently output by Wayfinder:
[ed. note: craigphiz last edited this post 10 years, 8 months ago.]