In 2022.2, we added two ways to set the camera height as the VR ground plane. Use Use Camera Height as VR Ground Plane in the Camera Editor or adjustHeight to configure a relative viewpoint when in VR mode. Both add the camera Z translation value to the HMD height, to make the camera height the new VR ground plane.
When Use Camera Height as VR Ground Plane enabled, as the camera moves up or down, so does the user and teleport pad. However, if either teleport On Geometry or Calibrate Ground is enabled, Use Camera Height as VR Ground Plane is ignored.
To set a new ground level and not use the camera height for the VR ground plane, in the active camera, disable Use Camera Height as VR Ground Plane in the Camera Editor > Advanced tab > VR section.
See Advanced Viewpoints in xR for more information.