I think, we already answered you in comments on Themeforest. Full width layout has no zoom option, because image is already has big size. Zoom script is available in product layouts with small images, like default product layout

when can i receive a reply? 

i am using rehub, dokan, woocommerce to setup a multivendor site, when i select full width extended style for single product details, the feature image when mouse hover not zoom (enlarge image), it not work in ie and chrome browser, but it work well in firefox browser. for example: https://www.arttelling.com/dokan/product/sample-product/canon-ef-70-200mm-f-4-l-usm-2/