media binding video quad layer scaling at set distance

There is no example for media binding quad layers. I am trying to integrate it and there is an issue scaling it to the set distance. By default it's small when moving further away from the camera. But if the layer size is changed it brings it closer again. 

How to set the distance to -20 but keep a large layer size ?
https://electroteque.org/dev/webxr-samples/layers/media-layer-sample2.html