The Folders view is special among all of the Navigation views. It displays the documents and folders as they are actually organized in the vault, similar to Windows Explorer. When you create new documents and move existing documents, you do so relative to the Folders view structure regardless of the current view.
The other Navigation views represent logical folder structures based on other document property values. That is, the documents don’t actually reside in the folders shown in Navigation views; the folders are simply groupings of documents with the same property values.
Meridian security roles are applied at the folder level in the Folders view. Thus, your ability to perform certain actions may be different in some folders as opposed to others.