I have this same problem! on my shop, I used this code to remove the 'add to cart' but it removed it for all of my listings:
.sqs-add-to-cart-button-wrapper {
display: none !important;
}
Here is a link to my website:
bigpawslargebreedrescue.squarespace.com
I am only trying to remove the add to cart for the "Surrender" service
Let me know what I need to do. I have NO experience or knowledge with coding so this would be so helpful! Thanks in advance