The details shared here apply to the most recent version of our themes. To keep your theme up to date, check out this helpful document.
You can disable the zoom for your product pages images within the theme's settings.
For Parallax, Retina, Responsive, and Mobilia:
Head into Customize > Theme settings > Product grid. Under Product Gallery > Image Gallery, change the option from "hover to zoom" to either none, fade, or slide.
For Turbo, Artisan and Flex:
Head into Customize > Select "Product Pages" from the drop-down selector. Under Sections > Product > Product Gallery, uncheck the "magnify product images on hover" or "magnify on hover" setting.