Disable the "Controllers not connected" message

Hi, 

Please help. I developed an app that doesn't require controllers, hands, or gaze (just relax and watch).

But after a while, the users get an annoying "(Right \ Left) Controllers not connected, press any key" popup message at each run. 

Is there a way to disable it through code or settings?  

(I am using Unity, OpenXR, and OVR)

Thanks