In the most basic of terms, those people added to a proof will see it
and can mark it up. So just add ONLY who you want. However, if others
have full access to a project in Workfront itself, they will be able to
see the proof by opening the documents tab and selecting the proof to
look at. I would take a look at who is allowed to see this particular
project by viewing your "share" area and your "staffing" under the
"more" tab. **side note- If you use templates to create projects like
this in fut...