Dell UP2414Q Monitor - Manual (Page 69)

Setting Up Your Monitor
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(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 differ-
ent 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.