Dual-monitors?

[aviceda]

Tried to configure dual-monitors today but don't seem to be able to make the smaller right-hand one the dominant (main) one, have tried changing settings in 'Display' and tick 'Nvidia Settings' checkbox to 'Make this the primary display for the X screen' but always end up with the larger left-hand (TV) monitor as the premier, any ideas on how to fix this?