The star indicates which Sudo is your Primary Sudo.
Your Primary Sudo is the default Sudo for various features where sharing, communications, or security of the app require a Sudo.
Primarily, if you have more than one Sudo in your Norton Privacy app, you may find that one is the default for most of your communications or it might be the one you want to use now for a particular event.
When you share contact information or do a quick swipe to send an email, text, or make a call, those communications will originate from the Primary Sudo.
Sending a Support Ticket will also originate from your Primary Sudo email address.