How to enable image enlargement in opencart 2.1.0.2?

Question

CMS

Good day to all !
People, tell me what kind of garbage, the image in the product card does not zoom (it does not increase in size when clicked),
I put the default files product.tpl and product.php - it still does not work.
What could it be?
Version Opencrt 2102
in the standard assembly of this CMS everything works as expected. Tell me, can anyone come across such garbage?
PS in the admin panel everything is fine