[Product Archive (Shop)] Image dimensions

Hi,

I have a question about changing the image dimensions on the producht archive page from the shop. Now it is cutting off the images, but can I set on one or another way that it don’t cut the images, but that the images are like a square (the same as the default image when no featured image is set on a product). See attachment for example.

Hope you can help!

Thanks,

Rubies