Private Communities: Enable "Unlisted" Status and Hide Membership on Storylines

When using private communities in Viva Engage, it's not always desirable for these communities to be discoverable. A welcome addition would be the ability to set an Engage community as both private and unlisted, thereby removing the option for users to apply for membership.

Currently, if a user is a member of a private community, this membership is visible to others on that user's storyline. This means it's possible to piece together the membership of private communities by viewing individual users' storylines.