The Document screen displays your files and folders. All Documents lists all types of files and folders together. To filter the list, select the viewing option from the left side column on the web. On mobile, click on the arrow at the top and select filter option: My Documents, Shared with me, Starred or Trash.
Shared with me lists all of the documents that have been shared with you.
Trash lists all the documents which you have deleted from My Documents.