screen setup in plasma/kde

Hello, I try to make some very special setup works in 15.3 (it works in 15.1 in kde and in 15.3 with xfce), with kde. to check what is done, I would like to where this setup is stored by the kde control center / display module, given it's only in kde that it don't works any hint? in .local or .config I didn't find it, but I'm not sure of what to look for :-( the xrandr corresponding line is xrandr --fb 1920x1080_60.00 --dpi 96 --output eDP1 --pos 0x0 --scale-from 1920x1080 --same-as VIRTUAL1 thanks jdd -- http://dodin.org