Hello Tak, Only if you delete those groups in O365, and do another import will those groups be removed, which I understand may not be possible for you to do. There's a pending JIRA on this, OKTA-31949. Hope that helps
Ping on this. Would love to remove the clutter of old groups mr predecessor created while hacking around our production instance. The inability to remove groups created by external sources is a real hinderance to administration.