Board Thread:Support Requests - Getting Started/@comment-46004342-20201006112803/@comment-9605025-20201006183134

For UCP, the system messages have been changed from "user-identity-box-group-*" to "user-activity-group-*" and are not currently editable. There is UserTags and ProfileTags but both have yet to be verified compatible with UCP. - Edit:

So, in short, you cannot change them at this time.