Transfer the folders under “Quick Views” to the main “Folders” List

My "Quick Views" lists some of my folders which are not under the main "Folders" List. I definitely created them, but I don't know how these folders got under the Quick View. I thought I can see the messages in the "Quick Views" and move them to the main "Folders" list. When I click any of the folders under "Quick Views", there are no email messages in any of the folders. How is that possible? I know that there must be several messages in those folders. How do I see those messages and move them to the main "Folders" list. Please help me. Thank you.