Use the steps in this article and the attached PDF to make your SMARTBoard work in “Extended Display” mode.
This will allow you to treat your displays as separate entities rather than as copies of each other. For example, if you’d like your personal monitor to display things that you’d rather your students can’t see then using the “Extended Display” setting is a better option than just duplicating your display.
You can find this setting on your PC by going to your Start Menu > Settings > System > Display
If you scroll down you should see a section that says “Multiple Displays” with a drop down. Within that dropdown, please select “Extend these displays.”
Once you have done that, follow the steps listed in this PDF.