In T10047#175129, @davidhurka wrote:

There could be a menu item “Help...”, which explains all the terms like Panel, Widget, Launcher, Task Manager, System Tray,... It could just open Help Center -> Plasma Manual -> Using Plasma (-> The Panel). There would be a screenshot like this:

Even in my mother tongue I didn’t know what exactly the “Systemabschnitt der Kontrollleiste” (System Tray) is. Everything could be related to the system...

Has anyone ever suggested hiding windows when editing the panel?
When moving plasmoids can happen that you move them outside the panel putting them on the desktop and you don't even notice it.