Demo Configuration File?

Can anyone point me to where / how configuration is stored? I've found a number of config files but none of them seem to hold anything graphic / UI related... not sure if there is an external config file. I'm trying to play with / increase UI scaling - even at 150% and 'auto-scale' checked off the UI is a little bit small for a 65" TV about 6' / 2 meters away from me.