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Activating WooCommerce Lightbox, Gallery Slider, Zoom
Activating WooCommerce Lightbox, Gallery Slider, Zoom is quite simple by adding:

add_action( 'after_setup_theme', 'mytheme_setup' ); 
function mytheme_setup() {
    add_theme_support( 'wc-product-gallery-zoom' );
    add_theme_support( 'wc-product-gallery-lightbox' );
    add_theme_support( 'wc-product-gallery-slider' );
}