Same, why would I want that turned off?The default setting for the logo adjustment is 'low'. The instruction manual recommends setting it as 'high' though. There is a section with regard to image retention/burn in and that is one of the changes that LG recommends. IIRC there isn't an 'off' setting on the C8.
Nope I was wrong, just checked, there is an 'off' for the logo luminance adjustment. However, as I understand it, the high means that the adjustment to the logo luminance is high i.e. the logo is less prominent on the screen so less likely to create image retention/burn in. I hope so since that's how I have the setting. Someone put me straight if I am wrong, please.