To use an iPad as a second screen on a Windows 10 computer, you'll need to use a third-party app like SplashTop.
If you changed your screen orientation by accident or simply prefer it a different way, you can rotate or flip it in Windows ...
If you spend a lot of time sitting in front of your PC or laptop, then you probably have a monitor in front of you. However, very few people pay attention to whether their monitor is actually set up ...