If you need to make a Factory Reset on your LG WebOS panel, please follow this steps:
Press for a few seconds the Settings button in the Remote control until a white bubble appears in the top-right corner of the screen.
While the bubble are in screen, press 0, 0, 0, 0 and OK. You will see the Signage Settings Menu appears.
Inside Under Signage Setup, scroll down to the Factory Reset options.
Select Factory Reset, Confirm and OK.
After a few moments the screen will be reset.