I can't see "Closed" projects

When a project has been marked as "Completed" it won't show in any of the project views. This is so that you can focus on the projects you still need to complete.

However, if you would like to see your completed projects all you need to do is set your "Complete" filter to "Yes" as follows:

When you have chosen to show projects with a "Completed" status they will show in whatever projects view you are looking at.