[ Version ( since = "1.10" ) ]
public Widget suffix { get; set; }
A widget to be displayed after the sidebar items.
The suffix will be displayed immediately after the items. To display it at the bottom of the sidebar instead, set [ property@Gtk.Widget:vexpand] to `TRUE` and [property@Gtk.Widget:valign] to [enum@Gtk.Align.END].
See [property@Sidebar:suffix].