To be honest, couldn’t believe it myself when I got this working!.
So full setup - download Splashtop Wired XDisplay agent for PC from splashtop.com (Free) and iTunes for PC. Load the Splashtop Wired XDisplay free app from your App Store (I used an iPad 2 on iOS 9! - guessing works on Android too, make sure data cable is genuine so it does the link and charges from USB). Start the Splashtop program on the PC and it automatically detects the iPad. Set Display to “extended desktop” in Windows settings. Now you can drag ANY Window to the iPad. So in FS2020, use Alt-Gr+/left mouse to pop-out and drag any of the cockpit glass displays - amazingly the EFB screen works! Job done.
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