Can I adjust the size of the box for my product recommendations?

My product page layout has a different theme and I am worried that the random recommendations will overcrowd and stretch the page into an awkward look. Is it possible to set the size of the box to make sure this will not happen?

Absolutely! You can set the size of the box that houses the product upsells to prevent the area from stretching and ruining your page. Check out this article for more info.