Dual monitor setup problem. [View all]

I have been using my Vizio TV as a monitor on my Windows 7 computer when I'm not watching a TV program. I had a Viewsonic monitor which was the original monitor for the W7 machine, and was advised to purchase an HDMI cable to add the Vizio when wanted. When I installed the cable, I automatically achieved a two monitor system where the cursor could migrate from one screen to the other. That system continues to work, and once when I had a resolution problem, I learned how to select the appropriate settings to alternate between the monitors at will.

Now comes my problem. I have attempted to add dual monitor capability to my Windows 10 computer. I've installed the cable and turned on the devices, only to find the cursor stays on the TV screen, but all the windows I need to open to try to fix my problem appear on the HP monitor. I can't get the cursor to move to the same monitor the window is on. The options for dual monitor are not as clear as on the Windows 7 and I must be missing something. Any clues?