I'm sorry about the issue. Did you click on Start\Control Panel\Appearance and Personalization\Display, then click on Adjust resolution on the left, then set the Multiple displays option to Duplicate these displays, then click on Apply at the bottom, and confirm yes?
If needed, there, lower the Resolution numbers and apply, and check.
(If you want to use extended option, then lower resolution for each display as needed (click on each display number (1 and 2) to adjust).
If needed, did you download / install the graphics driver / software?
Please reply at the box below to continue troubleshooting. Thank you.