I can configure dual head mode in personal settings –> display, but on the next login the setting is gone and its back to the default :-(. Thats pretty inconvenient.
I agree that it would be nice to be able to make changes here persistent. Many users no longer have the xorg.conf file present, but for persistent dual screen setups, one needs to be created.
These references might be helpful here:
Intel Linux Graphics: Dual Head Setup How To
The other option is to use xrandr to configure your displays upon login.