Hello,
Add the next code in Theme Options > Theme Custom CSS:
.content-product .product-content-image img {
width: auto;
max-height: 200px;
}
.content-product .product-content-image {
min-height: 200px;
}
Read about size/crop settings here – https://xstore.helpscoutdocs.com/article/89-product-images
Regards