Hello,
To display the wishlist icon in the center inside the product grid item you can use the below CSS in Theme Setting >> Custom CSS >> Global CSS section:
.woodmart-hover-base[class*=add-small] .wd-bottom-actions .wd-action-btn>a {
margin-left: 50%;
}
Also if you want to remove that border line shown next to wishlist icon you can use the below CSS code:
.woodmart-hover-base[class*=add-small] .wd-bottom-actions>div:not(:last-child) {
border:none;
}
Best Regards.