Simply click on the little gear icon above the forum list to bring up your site Display Settings page:
And check/uncheck forums on the right side of the Display Settings, Home Page tab:
Thanks to Terry and Marc for the suggestions on this enhancement - I really appreciate it!
- Off Route used to have it's own show/hide checkbox on the Display Settings page but that checkbox is gone and Off Route is now included in the list with all other sub-forums.
- Off Route threads do not show up when you're not logged into the site but the rest of the forum filters will not be applied when you're logged off.
If you experience any problems using this new functionality, please post in the Site Problems and Resolution section of the forum.