Container Background Image Letterboxed

I have a container background set to a JPEG image, which is a normal 16x9 image.

That image is consistently letterboxed, where 1/3 of the vertical height is clipped. What do I tweak in the container inspector to show the full vertical image?

You can see the clipping in the attached PNG.

a container has no height when you drop into page, it changes height according to components dropped in or container height / padding etc
the background image is part of the container

basic showing

depends how you want the image to behave at different screen widths