Hello, when I leave the device for a while, the system sleeps and the screen turns black and I have to enter the password and sometimes the system freezes. The question is, how do I cancel this option in dom0 ?
sounds the xfce settings, specifically the power settings, could configure that.
Power settings, display and screensaver settings.
I switch to kde instead of xfce because settings like these are easier to find
uh oh 
that sounds a lot like my issue I just had