In Windows 7, how does one copy and expand external display?

We need to connect to the external monitor first, right-click the blank fold on the desktop, and click the red box shown in the figure in the pop-up menu;



In the window, we can see that the numbers 1 are laptop LCD and the numbers 2 are external displays.



Click the drop-down list for more monitors to quickly copy or expand these displays, as shown in the following figure.



We then choose to copy these displays,



Click application. Now, you can try to connect it to the host machine.