You can disable viewing profiles via Studio > Permissions > Actions > Unauthenticated > disable "View Person's Profile"
Also you can restrict people to \browse pages via Studio > Pages > Persons > New People (or other pages) > Settings > Visibility > check all levels except Unauthenticated
Thanks for that Alex. The first option you suggest I had done already but unauthenticated users could still click on the "People" and discover from there. The second option you provided works.
