Ubuntu 7.10 introduced new default directories: Documents, Music, Pictures, Public, Templates, and Videos. Some of these are shown in the Nautilus side pane, the Places menu, and file dialogs. If you don’t want one of these directories, deleting it will cause it to disappear from these locations. But want if you want to show your own directories?
Nope, you don’t have to edit any configuration files. Open the Nautilus file manager.