Hello,

Our demo uses these sizes:

Main image width – Image size used for the main image on single product pages. These images will remain uncropped. Image width used in demo sites are: 600px.
Thumbnail width – Image width used for products in the catalog, Image width for the catalog is 350px.

You can find more details: https://xtemos.com/docs-topic/image-size-and-content-alignment-in-a-product-grid/

If you have any questions please feel free to contact us.

Best Regards