Hello,

Please find and replace the code on line 53 in the functions.php of the child theme:

add_filter(
    'woodmart_product_gallery_settings',
    function() {
        return array(
            'thumbs_slider' => array(
                'items'     => array(
                    'desktop'          => 7,
                    'tablet_landscape' => 7,
                    'tablet'           => 7,
                    'mobile'           => 7,
                    'vertical_items'   => 7,
                ),
            ),
        )
    }
);

Best Regards