I don’t thing it’s called anything — it’s just a particular arrangement of UI. There’s nothing special to it. Do the UI tutorials, and you’ll know everything you need to know.
To restrict the camera to render only in the area marked “Scene,” set its Normalized View Port Rect (see the Camera page in the manual).
However, you might find it easier to let the Camera default to rendering to the whole screen, and then draw the UI on top. If you use Unity UI (see Joe’s link to the tutorials), you’ll want to anchor the tall UI to the right edge of the screen and the wide UI to the bottom edge.
While the full scene rendering thing seems easier at first, it quickly can end up becoming offset hell when it comes to things like spell effects and hitscan weapons while also accommodating multiple resolutions/aspect ratios. It’s really worth learning the view port rect stuff first, I feel.
What I ended up doing was adjusting the Viewpoort Rect of my main camera.
I needed my player to be centered in the middle of that portion of the screen and this was by far the easiest way to accomplish that.
Luckily I am going for a 2D game that dosnt involve really anything other than text. no projectiles so I’ll be fine.