Would you like a step-by-step guide for setting up or Duet Display instead?
Splashtop Wired XDisplay is a proprietary software solution that allows you to use your iOS device (iPad or iPhone) or Android device as a secondary monitor for your Windows PC or Mac. Unlike wireless solutions like Sidecar or AirPlay, "Wired" XDisplay utilizes the physical USB/Lightning cable.
On Windows, press the and select Extend to begin using your mobile device as a second monitor. 🆚 Comparison: Extended vs. Mirrored Modes