Preview window image size

[Yuri-Njathi]

Very nice library.
I'm taking images using picamzero code snippet below:

from picamzero import Camera
from time import sleep
cam = Camera()
cam.preview_size = (4000,2500)
cam.still_size = (4608,2592)
cam.start_preview()
sleep(2)
cam.take_photo("test.jpg")

The specific issue is that the preview doesn't show exactly what the image is saved as, it previews a section.
How can I make sure I see the same thing in preview that is in image?