Nreal light app screen

Hi, I’m using unity to create an application to use in nrsdk for nreallight.
When I created the app or checked the demo of nrsdk, I noticed that the background screen of the app was black when I ran the app.
I want to create an app that moves and interacts in a real place, so I want to make the structure visible on the real screen, not on the black screen of the app.
I want to know how to make the background color of the app transparent or allow the app to see outside. Thank you.

Can I ask what demo you used to build in Unity?