Tasks: filter by "open"

Tasks: filter by "open"

I had my tasks on filter by open but when there's no open tasks in a task list, that task list is gone.  Is there any way to change that so I can see all task lists even when there are none open?

Also, I removed the open status so I could see everything but now I don't want to see the tasks that are closed.  How do I set this back to see open tasks only?