Administrators can edit sharing settings for any project. However, an administrator can edit sharing settings for more than one project at the same time, only if all the projects have the same owner.
The sharing level of a named user takes precedence over the sharing level of All Qeystone Users. For example, if a named user has Can View access and All Qeystone Users have Can Edit access, then everyone can edit and save the project, but the named user can only open and view the project.
After you share a project, alert users that the project is shared with them. See Send an email link to a project.