В файле /themes/default-bootstrap/js/product.js
//set jqZoom parameters if needed
$('.jqzoom').jqzoom({
zoomType: 'innerzoom', //innerzoom/standard/reverse/drag
zoomWidth: 458, //zooming div default width(default width value is 200)
zoomHeight: 458, //zooming div default width(default height value is 200)
xOffset: 21, //zooming div default offset(default offset value is 10)
yOffset: 0,
title: false
});