Dell UP3214Q Monitor - Manual (Page 70)

70  Setting Up Your Monitor Display
(iii) For Windows® 8/Windows® 8.1
„ Extend these displays: This option is recommended when an external
monitor is connected to a laptop, and each monitor can display different
screen independently to improve user convenience. The relative position
of the screens can be set up here, for example monitor 1 may be set up
to be to the left of monitor 2 or vice versa. This depends on the physical
position of the LCD monitor in relation to the laptop. The horizontal
line displayed on both monitors can be based on the laptop or external
monitor. These are all adjustable options, and all a user need do is drag
the monitor of the main screen to the extended monitor.