i ‘fixed’ it by using CSS via WordPress Display > Customize > Additional CSS and adding the following lines:
.woocommerce ul.products li.product a img {
width: 70px;
height: 150px;
display: block;
margin: 0 0 1em;
-webkit-box-shadow: none;
box-shadow: none;
}
Adjust width and height to fit your needs.
Probably not the best way but hey.. it works for me.
