I’m aware this is a little confusing, and I hope this is something we can clarify in the future! Technically speaking the URL of your Portfolio is public; this means that if you share this URL with anyone in your organization, they will be able to access your Portfolio. While you can add teammates to your Portfolio too, you’re completely right, it is currently not possible to search for Public Portfolio in your Organisation.
This is our first shot at Portfolio and we’re currently collecting feedback to help improve them in future updates.I f you haven’t yet, you might be interested in adding your vote to some of these threads from our #productfeedback