Refapp users can only access and see projects that they themselves have added or, have been invited to participate in by another user.
Only those who have the access right Administrator have access to and can view other users' projects in Refapp.
If you are an administrator, you have a toggle on your start page where it says Show all projects.
When you activate that toggle, all projects in Refapp will be visible in the list.
To be able to make changes to a project, help add candidates, request answers from a referee, etc, you need to participate in the project.
As an administrator, you can add either yourself or another user to a project, regardless of whether you are a participant or not.
Click on the "Plus" icon next to the project title to add a colleague to the project.