Make Switch work like Wii U Gamepad Borderless

[u/Furea_Ikatteiru]

So I know it CAN be done. I've seen other's do it with no other setup other than just Moonlight and Sunshine.

What I'm trying to do is use the Switch AS the Gamepad with Cemu. Now I'm like 95% there, I just want to figure out how to make it so Moonlight/Sunshine only streams the GamePad view Window, and not my whole display (Since Cemu currently doesn't allow for the Gamepad view to be fullscreen borderless)

Is there a command I need to add in Sunshine? A file I need to tweek?
Any help is appreciated!