KDE Plasma 5.18 Fix - Unlock Desktop and Widgets

If you have updated to KDE Plasma 5.18 and are unable to unlock your desktop to add widgets or change panel settings, here is a quick video explaining how to do this. A bug report was submitted and has already addressed so this should resolve itself soon. The command to run to fix it is:

qdbus org.kde.plasmashell /PlasmaShell evaluateScript "lockCorona(false)"