The desktop file `gnome-control-center:gnome-printers-panel.desktop` doesn't have LXDE listed in the OnlyShowIn, but is among the 2 other items displayed in the System Settings window...
The desktop file `gnome- control- center: gnome-printers- panel.desktop` doesn't have LXDE listed in the OnlyShowIn, but is among the 2 other items displayed in the System Settings window...