There are some shortcuts on Windows to switch your monitor display up, left, right, or down. I've considered about these shortcuts when my baby accidentally switch my laptop display. Don't panic if you got the same situation, just use the shortcut (Ctrl + Alt + Up) to set the monitor back to normal.
Here are the complete shortcuts:
Ctrl + Alt + Up : Set the monitor display to up (normal).
Ctrl + Alt + Left : Set the monitor display to left.
Ctrl + Alt + Right : Set the monitor display to right.
Ctrl + Alt + Down : Set the monitor display to down.
