Quantity box disappears

Site URL: https://www.tremblaysweetshop.com/brittle/p/43po0d7xhg2jzw5imzdldhshrwyh5i

https://www.tremblaysweetshop.com/brittle/p/43po0d7xhg2jzw5imzdldhshrwyh5i

Password is tremblays

The quantity drop-down box is automatically present as long as my products have at least 1 variant. My products with no variants (see above link) have no quantity option. If I add a variant to these products, the quantity box shows up with them. When I remove the variants, so goes the quantity box. I saw some posts about toggling a quantity option but could not find it anywhere. Thank you 

Oh, I did not even realize that was an option. I found the "track inventory" option and toggled it off. Thanks so much!