The taskbar is displayed under the extended screen!!!
The Win7 system itself cannot set this feature (I do not know at the moment)
However, third-party software can be downloaded to resolve the issue.
First step: Dual Monitor taskbar download software
Download Link: http://pan.baidu.com/s/1o61isjw Password: YZCP
Step two: The taskbar appears on the extended screen after installation
Step Three: Right-click the properties in the taskbar under the extended screen to set the relevant functionality.
For example, display windows keys, can mirror-two taskbar control the same page, you can also set a separate control of their own display page.
This solves the function of the two-screen dual-taskbar.
View the following effects:
Main display taskbar
Sub-display task bar
How to display the taskbar on two screens when the Win7 system expands dual screens