Stop my banner image from zooming

I need to stop my banner image from zooming in a ridiculous amount. AFAIK it's not an issue with the size of the image and I am aware of the focal point. How can I stop Squarespace from resizing my banner image so drastically and just use the full image I upload as the banner?

i havent found an actually solution yet but what i do is take my image into photo shop and create a white border around it. then import it into squarespace and it fixes the zoom problem.