Ok, I made a really stupid decision. I was having issues with my monitor until eventually, the taskbar and all icons disappeared and the only thing left was my wallpaper. My cursor went offscreen. So I right clicked, selected properties, and nothing happened. Then I realized that the window opened offscreen and after a while of clicking and dragging, I brought it up and started trying options to make it work.
Then I saw a checkbox "Extend Desktop To Monitor", unchecked it and clicked apply. Then I realized what I had done, and it was a bad decision because my laptop screen is completely broken, and I cannot use my monitor.
What do I do?