Is there a way to restore a "View" to default?
Release : 15.7.1
Component : CLARITY MUX USABILITY
The ability to restore a person to the basic View doesn't necessarily exist. The recommendation would be to log in with a user who still have the default View, and have them save the View, and share it. The ability to share Views has been expanded in 15.8:
See Manage Saved Views for more information.