Changing My Projected Display
Are you trying to change how your PC Desktop screen shows on your projector or TV screen?
Right Mouse Click on your Desktop Background > Display Settings > Scroll to where it says "Multiple Displays" >
Select either "Duplicate These Displays" (to show a direct copy of your desktop screen on the projector / TV OR select "Extend These Displays" (Move your mouse over to the other screen. You can also drag windows and programs over to this extended display).
Change the PC Screen order
When Extending your Display, If your mouse is not moving to the correct side of the screen, you can drag and move the screens in this window.
Don't forget to press Apply to commit these changes.