I want to invite someone to view a board I created. Will they see the other boards I created that are attached to a different organization? I've been testing with secondary email address and I can access everything.
Visibility level: Organization:
Any user who's a member of an organization can see all boards, but they shouldn't be able to see boards in other organizations unless they're also members of that organization.
It looks like you can mix'n'match board visibilities (not sure to what extent), best to try it and see what works for you.