How can oculus app get the screen one eye sees?

Hi.

I want to get(cast) the screen that one eye sees.

When I use scrcpy, I need to crop the streaming video to get one of them.

(If I don't use any option, I get screens that each of them is seen by right and left)

However, I don't need to do that when using oculus app because I can get screen that one eye sees.

Actually I wonder whether oculus app crops the streaming video or oculus quest 2 sends the one screen when using oculus app.

[Using scrcpy without options]

[Using oculus app. I want to know how oculus app can get the only one screen]