From where comes the content of the Recent folders and Recent files menus?
The Recent folders and Recent files menus list the recent places or documents memorized by Windows. An option in the Menu tab of the Options window determines the number of items displayed in these menus (default is 10).
Quick Access Popup Recent folders and Recent files are taken from the Windows virtual folder Recent items (C:\Users\[username]\AppData\Roaming\Microsoft\Windows\Recent or, using the appdata variable, %appdata%\Microsoft\Windows\Recent).
This Windows system folder lists the files and folders recently accessed by the user. The Recent Folders menu includes only folder items from this list and the Recent Files includes the rest of it.
Windows is also using this list to populate the Recent Places virtual folder found in Explorer left pane. Recent items are also used to populate the Microsoft applications Jump Lists.
If you want to delete the content of Recent Items folder and of these QAP menus, see these instructions: How can I delete the content of the Recent Folders or Recent Files menus?