The C2 is a great screen, but all the 'smart' stuff kinda spoils it if you just want to use it as a monitor.
You can turn off some of the stuff, rough guide here
You can also set the Lg quick access, so lets say button 2 can be set for hdmi 1 PC input. Then when its off you can hold down button number 2 for few secs and let go and it just switches on TV straight to PC input, no menus, adverts, home screens or anything just directly switches on to Pc screen or your assigned source.