Dell UP3214Q Monitor - Manual (Page 72)

72  Setting Up Your Monitor Display
(iii) For Windows® 8/Windows® 8.1
2.DELL UP3214Q
„ 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
mainstream resolutions. As shown in the figure above, the resolution
of the laptop monitor is only 1366 x 768, but after connecting a 32”
external LCD monitor, users can immediately improve their visual
enjoyment to 3840 x 2160 UHD quality.