Change Slug on Pro Sites Plugin

I would like to change the slug for the pro sites plug in. How do I do this? I renamed Pro Sites, and then renamed it again to make it plural i.e. mydomain.com/myname-site should be mydomain.com/myname-sites. This has been changed to plural under the Pro Sites Settings page under Rebrand; however, these changes are not being reflected in the slug. Thank you in advance.