Three different settings
1 "Extended Display"
When you connect two monitors to your computer, the feature "extended display" is by default. The extended display is to expand the display to two monitors, such as my machine is a 1440x900 resolution and a 1280x1024 resolution of the machine, extended display after the total resolution is 1440x900+1280x1024.
Show effects See figure II, figure three, where there is a single monitor with the taskbar (my taskbar is at the top)
If you need to place the taskbar on a different monitor, see figure Four
2 "Copy Display"
If you use the "Copy display" method, both displays are displayed using a display resolution that you can use. For example, two monitors on my machine now support the display of 1280x800, and two monitors display exactly the same content.
The effect is as shown in the figure
3 "single Monitor display"
If you use the "Display desktop with only 1th monitor", the other monitor will not work. You are free to choose any one of the two monitors as a monitor.
Other Notes
1 Independent graphics and integrated graphics are not able to output images at the same time.
2 If you need to change the display position of the monitor, such as left and right exchange. Please refer to the figure below