Hello,
Try to add the next code in Theme Options > Custom CSS:
.wishlist-btn-container.with-styles .single_add_to_wishlist {
display: inline-flex;
align-items: center;
justify-content: center;
}
.single-product .yith-wcwl-add-button > a i {
display: none;
}
.wishlist-btn-container.with-styles .single_add_to_wishlist:after {
display: none;
}
Regards