Docklike taskbar for Xfce acts similar to how many
other OSes and desktop environments act, by having
docks wherein all windows of an application are
grouped together as an icon. Pinning is also
supported so that the icon can act as a
launcher when the application is not running.

Homepage:
https://docs.xfce.org/panel-plugins/xfce4-docklike-plugin/start
