Description The GtkHSeparator widget is a horizontal separator, used to group the widgets within a window. It displays a horizontal line with a shadow to make it appear sunken into the interface. Note The GtkHSeparator widget is not used as a separator within menus. To create a separator in a menu create an empty GtkSeparatorMenuItem widget using gtk_separator_menu_item_new() and add it to the menu with gtk_menu_shell_append().