Make more obvious there on-click scripts are possible.
Somewhat a "hasty user doesn't notice everything" issue; the information is there.
User expectations may also differ, they may not expect it to be inside tags. For instance they might expect to see a second script for clicks, then skim https://docs.xfce.org/panel-plugins/xfce4-genmon-plugin/start#usage but not notice the etc because it's a sub-list element. Also maybe better to add a second paragraph at the top mentioning that it can launch scripts.
Possibly also an info button before the "Command" label or below that a label "For launching scripts on-click see documentation."