Access others have to separate boards associated with different organizations

Question

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.

Answer 1

Visibility level: Organization:

This board is visible to members of the organization. Only those invited to the board can edit. The board must be part of an org to enabled this.

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.
Additionally, if you mark a board within an organization as private then only invited users can see that board (this is what one of my colleagues does for his personal board within the organization I created for our company).

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.