Can you segregate private confidential envelopes for signing from envelopes in a shared access folder?

When you have set up Shared Access for a team to collaborate the team can easily view and act on envelopes. 

When an individual receives an envelope that should ONLY be visible to the individual can you restrict access to that individual and hide it from the Shared Access group?

If I am in multiple Shared Access groups can all users see all my documents in the groups?