I went to Kmenu > System settings > Monitor & Display > Administrator mode and under the size, orientation & positioning tab the "second screen" box is not checked. but under the hardware tab it shows 2 monitors: Monitor #1: Plug 'n' play Role: Primary (1) Monitor #2: <unkown> Role: Secondary (2) There doesn't seem to be an option to disable twinview. Thanks for your help and time.
