Hi,
Please follow the 3 steps to achieve the 2 requirements

1.
Please login FTP to remove the 3 files in theme folder /themes/air-theme/ :
/woocommerce/content-single-product.php
/woocommerce/single-product/product-image.php
/woocommerce/single-product/product-thumbnails.php

PS: You can also copy the 3 files from /plugins/woocommerce/template/ folder to child theme folder.

2.
Add the codes in the /themes/air-theme/function.php:

add_action( 'after_setup_theme', 'yourtheme_setup' );
function yourtheme_setup() {
//add_theme_support( 'wc-product-gallery-zoom' ); // If you use zoom ,   un-comment this line.
//add_theme_support( 'wc-product-gallery-lightbox' );  // If you use lightbox,   un-comment this line.
add_theme_support( 'wc-product-gallery-slider' );
}

3.
Please paste the custom css code to “Appearance > Customize : Additional CSS”

.single-product .up-sells.upsells.products,
.single-product .related.products,
.single-product .tabs-h 
{clear: both;}
.ux-woo-wrap .flex-control-nav 
{position: static;}

Regards!
Bwsm – uiueux.com – Twitter – Facebook