This tab is available to all users who have at least viewer access to the document. Users with editor access or higher can associate projects with the document as long as they have permissions to access the project. Users who view this tab will only see projects where they have at least viewer permissions to the associated projects. To modify the relationship, users that have editor rights can select Relate Projects.
Projects Tab View
Modify Relationship View
Users may also create and associate new projects with a given document from the project tab. To do this users will select the new project button on either the project tab view.