How to disable xfce screensaver

Everything about starting a Xfce session is defined in /etc/xdg/xfce4/xinitrc. If you need to disable disable Xfce screensaver (xscreensaver) is better if you just change the global xfce4 property that is called "/startup/screensaver/enabled". In case that this property is not already defined is best to use -n (create) option and then we must also provice the -t (type) for that new property (which will be bool).

/usr/bin/xfconf-query -c xfce4-session -n -t bool -p /startup/screensaver/enabled -s false