Aspect ratio for screenshot

Hello,

I am relatively new to UE.
However i am doing commercialy some furniture packshots.
There is a little problem because i am taking a screenshot in default aspect ratio ( which is i guess 16:9 ?)
and i don’t know how to change it.

I wouldn’t like either to render it as you render a movie or just a frame because it will just take too long.
The point is to make it pretty fast and automate the process as much as possible.
Thanks in adavance.!

(the image is in the default aspect r )