The Products theme setting controls the aspect ratio of the product images. The aspect ratio is the proportional relationship between an image's width and height. These settings determine how the product images fit into the theme's image containers.
Adjust the aspect ratio
Select an option from the Product aspect ratio dropdown. There are four options:
Activate the Enable image crop option to have images to fully fit their containers. Disabling this will generate white space around the image to create a uniform grid without cropping your image. The background in the editor indicates the applied white space, but will not appear on your storefront.