Key features of Audience Control
Enforce login - This forces users to login with Google to view the map
Restrict with domains, Emails - This controls who (email/domain) can view the map
Switch on Enforce login by Audience to force users to login to view the map.
You can restrict your audience by
Any - Allow any audience to view the map.
Emails - Allow only given emails to view the map.
Domains - Allow only the users from the given domains to view the map.