"Folder view" refers to the way files and documents are displayed on a computer or device. It allows you to organize and see all the files in a particular folder, similar to how you see papers in a physical folder. Full definition
Note the left folder view and inbox on the right. (eweek.com)
In the settings menu there's an option to switch to folder view instead, which makes organizing collections and keeping track of a large number of ebooks a lot easier. (the-ebook-reader.com)
These folders may be hidden by the file system, so you may need to enable hidden folder viewing to find them. (lazy8studios.com)