[![I used blender's old versions many years ago. In 2.8 UI has been changed. I am at a loss. I am in need to get a rendered image tomorrow, a cars interior picture, I got the .blend file from internet (https://free3d.com) (url will be given below) but unable to render the image with intended perspective (intended one is shown in green in picture).
If you want, as it were, to change the crop of the existing perspective you can see, that's a (true) zoom, rather than a track/dolly of the camera, which is what the scroll-wheel gives you.
Select the camera by left-clicking its border in Object Mode, go to its Properties > Data tab, and change its Focal Length setting.