Dell UP2414Q Monitor - Manual (Page 71)

Setting Up Your Monitor
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(iii) For Windows ® 8/Windows ® 8.1
 Show desktop only on…: Display the status of a particular monitor. This
option is typically chosen when the laptop is used as a PC so the user
can enjoy a large external monitor. Most current laptops support main-
stream resolutions. As shown in the figure above, the resolution of the
laptop monitor is only 1366 x 768, but after connecting a 23.8” external
LCD monitor, users can immediately improve their visual enjoyment to
3840 x 2160 UHD quality.