New folders can be added via drag and drop to the Quick Access group. This ensures that those files are not displayed anymore.
It is interesting to note that you can remove files listed under recent files from Quick Access by right-clicking on them and selecting 'remove from quick access' from the context menu. If you right-click a pinned item, the full context menu is displayed whereas a right-click on an unpinned folder displays only an expand option. It remains a mystery why the 'remove from Quick access' option is available on the same page and in the sidebar.
