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      Why is the "Play in editor" button for VR preview greyed out/disabled in Unreal Engine?

      "Play in editor" button for VR preview is greyed out/disabled in Unreal Engine.

      In Varjo Base:

      1. Go to System tab
        1. Set OpenXR to ON.
        2. Set OpenVR to ON
        3. Set Mixed reality for OpenVR to ON
        4. Set Headset tracking to SteamVR


      In SteamVR:

      1. Go to Settings - Developer
        1. Set Current OpenXR runtime to Varjo OpenXR

      Please follow this documentation on how to set up your project in Unreal Engine:
      https://developer.varjo.com/docs/unreal/ue5/getting-started-with-unreal5