Created attachment 112185 [details] applet started directly from the panel Audio volume applet is wrongly sized when added directly to panel (for example on a supplementary screen, but it's unrelated to multi-screen setup) and not to a systray applet. See the screenshot attached.
Created attachment 112186 [details] Applet started from systray
Same issue here. At first I thought it might have something to do with the unintentional changes to the plasmoid's config files or sources, respectively in ~/.config and /usr/share/plasma, but after fiddling and re-installing, I think it's probably some bug with sizing logic in the plasmoid itself.
Still having this issue? I know I have :(
related https://bugs.kde.org/show_bug.cgi?id=413448
Fixed in 5.18.0