Inserts a new folder below the active folder, or as a sibling to the currently selected
rule, in the rule list. If you select an open folder, the software creates the new
folder inside the selected folder. The software is assigned a default name of New Folder n. The letter n represents the next unused, sequential number. For example, if the last folder that
you added was 15, the next new folder is New Folder 16. The default folder name can be renamed.