Hi
You could add 12 as an option by going to neighborhood/woocommerce/loop/result-count.php and editing line 58:
<a class="show-products-link" href="?show_products=24">24</a>/<a class="show-products-link" href="?show_products=48">48</a>/<a href="?show_products=<?php echo $total;?>"><?php _e("All", "swiftframework"); ?></a>
however you can’t change the default amount
– Kyle