Aspect Ratio Behaviour

Is there a way to tell Unity how to behave under different aspect ratios? I’m basically designing my game from the bottom right towards the top left. I’ve made such that even the smaller 3:2 and 4:3 aspect ratios will be playable, but larger aspect ratios will have more flavourful scenery.

However for the larger aspect ratios the camera expands in all directions. Is there a way for me to lock or anchor the camera so that it only grows upwards and leftwards to fullfill these aspect ratios?

Maybe changing the camera Field of View (FOV) ?

Errrr this might seem silly but which option is the Field of View?
Is it in the transform component or in the Camera component.

IN the camera component I have

Projection, Size, Clipping Planes, Viewport Rect, Depth, Rendering Path, Target Texture , occlusion culling and HDR.

It’s on the Camera component.