The product gallery introduced in 3.0.0 (read here for more information) uses Flexslider, Photoswipe, and the jQuery Zoom plugin to offer swiping, lightboxes and other neat features.
3.2, the new gallery is off by default and needs to be enabled using a snippet (below) or by using a compatible theme. This is because it’s common for themes to disable the WooCommerce gallery and replace it with their own scripts.
3.3+, the gallery is off by default for WooCommerce compatible themes unless they declare support for it (below). 3rd party themes with no WooCommerce support will have the gallery enabled by default.
To enable the gallery in your theme, you can declare support like this:
add_theme_support( 'wc-product-gallery-zoom' ); add_theme_support( 'wc-product-gallery-lightbox' ); add_theme_support( 'wc-product-gallery-slider' );
You do not have to support all 3 parts of the gallery; you can pick and choose features. If a feature is not enabled, the scripts will not be loaded and the gallery code will not execute on product pages.
If gallery features are enabled (e.g. you have a theme which enabled them, or you are running a non-WC compatible theme), you can disable them with
remove_theme_support( 'wc-product-gallery-zoom' ); remove_theme_support( 'wc-product-gallery-lightbox' ); remove_theme_support( 'wc-product-gallery-slider' );
You can disable any parts; you do not need to disable all features.