Unable to position the camera perfectly [![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). 

Please help me get a nicely rendered image of the required perspective. It will be very helpful for me. URL of .blend: https://we.tl/t-2b2hcIFG9y ]2]2
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.