Setting “Configure GoogleVR Deployment Mode” to “Daydream & Cardboard” breaks enabling/disabling of VR mode on both Cardboard and Daydream viewers.
However it does work if just setting “Configure GoogleVR Deployment Mode” to “Cardboard”, where it will desirably fall back to the magic window navigation method.
I am currently enabling/disabling VR mode using the EnableHMD Blueprint node.
Tested on a Google Pixel with Daydream View and Google Cardboard 2.0.
Regards,
James