To hide default related products when using related products shortcode – By WebToffee(Related Products - Create Upsells, Cross-sells, and Product Recommendations for WooCommerce)

functions.php

<?php //Do not copy this line of code
/**
 * Hide default related products when [wt-related-products] shortcode is used
 */
function wt_custom_hide_default_related_products() {
    if (is_product()) {
        global $post;
        if ($post && has_shortcode($post->post_content, 'wt-related-products')) {
            // Remove WooCommerce's default related products
            remove_action('woocommerce_after_single_product_summary', 'woocommerce_output_related_products', 20);
        }
    }
    if (is_cart()) {
        $cart_page_id = get_option('woocommerce_cart_page_id');
        if ($cart_page_id) {
            $cart_page = get_post($cart_page_id);
            if ($cart_page && has_shortcode($cart_page->post_content, 'wt-related-products')) {
                // Remove the plugin's automatic rendering for cart
                remove_action('woocommerce_after_cart', array('Custom_Related_Products', 'render_related_products_in_cart'));
                remove_filter('render_block', array('Custom_Related_Products', 'render_related_products_in_block_cart'), 10);
            }
        }
    }
}
add_action('wp', 'wt_custom_hide_default_related_products');