Meta Quest Developer Hub's Cast for Quest 2 - Aparent stabilization effect

The Casting window has the round black bars around, which I think it's because of the lenses..

But, we have the option of Cinematic 16:9, which should be a rectangle like image, not only the window
Is there any way to get rid of the borders that keep showing? Like they're stabilizing the image without actually doing it.

Here's a link of a clip I created for example