To use an iPad as a second screen on a Windows 10 computer, you'll need to use a third-party app like SplashTop.

Recovery Mode: Connect iPad to a computer > open Finder (Catalina or later) or iTunes > restart > Update from the recovery screen. If you don't have access to a computer, use iCloud to wipe the iPad ...

Sometimes you just need a quick and easy way to connect a second monitor, without dealing with a whole new display. Apple's Sidecar feature lets you turn your iPad into a second display for the Mac, ...