Hi,
Thank you for contacting Microsoft Community.
I understand that you are facing the issue on extend display.
I will certainly help you with this.
I would suggest you to go through the below methods:
Method 1: Try to set the monitor again to pc screen and again switch to extend display:
- Press Windows key+P.
- Click on pc screen only.
- Again press Windows key+P and select extend display and try to drag the browser to the extend display.
Method 2: Refer the link below and check if it helps:
Move windows between multiple monitors
http://windows.microsoft.com/en-in/windows/move-windows-between-multiple-monitors#1TC=windows-7
Also refer the link below:
Guided Help: Dual monitor setup is easy in Windows 7!
https://support.microsoft.com/en-us/kb/976064
I hope this helps. Feel free to write us back for any further assistance with Windows, we’ll be glad to assist you.