Hello,
You can add this code in Theme Options > Custom CSS:
.categories-products-two-rows .bottom-product {
display: none;
}
but this is not the best solution because hidden products are loaded on the page still.
Another solution is a bit more complicated – copy etheme_category_shortcode function from wp-content/plugins/et-core-plugin/inc/shortcodes/category.php file into your child-theme/functions.php and remove this part of code – http://prntscr.com/pf64h3
Regards