Missing gallery thumbnail size setting?

Unless I missed it somewhere, it appears the product gallery image thumbnail size setting is nowhere to be found in the main settings and the customizer.

Screenshot

UPDATE: It appears I’m not the only one who has an issue of the missing gallery thumbnail setting where there are only two options now. I noticed this was posted in comments on the WooCommerce site.

No longer being able to set a gallery thumbnail size is a bad decision. I’m also guessing a lot of people are not aware of this setting being removed.

Basically what I had to do for a theme I am making from _s is force a thumbnail size with a padding to put spacing, then compensated the container so everything lines up with the main product image:

.single-product div.product .woocommerce-product-gallery .flex-control-thumbs {
   margin: 0 -5px; /* align left and right gallery with main image */
}
.single-product div.product .woocommerce-product-gallery .flex-control-thumbs li img {
   /* force a thumbnail size */
   width: 160px;
   padding: 0 5px;
}