I was looking for the parameter which is handling the background so I opened the **settings.cfg** file, then the search module with **CTRL+F** and typed **BACKGROUND**, I was surprised that the search found nothing. I have eventually found it manually line 121 with this ortho :
>> G_USE_HIGH_QUALITY_ACKGROUND =
"ackground" should be correct "background" since most of users would instinctively search as me "back" in the module in order to find the parameter.