The goal of the xfce4-quicklauncher-plugin is double. First, it is intented to offer you a fast and easy way to configure the plugins which are on your panel. Secondly, it is able to display these launchers on one or more lines, and they are displayed so that they don't waste space. They also feature a little zoom effect when you pass the mouse over them. WWW: https://goodies.xfce.org/projects/panel-plugins/xfce4-quicklauncher-plugin