[DH Evanto]

Dear, If you want display only category children. Please change custom code to

add_filter('woocommerce_get_related_product_cat_terms', function($cats_array, $product_id){
    $cats_child_array = array();
    foreach ($cats_array as $cat_id){
        $cats_child_array = array_merge(
            $cats_child_array,
            get_terms(
                'product_cat',
                array(
                    'fields'       => 'ids',
                    'parent'       => $cat_id,
                    'hierarchical' => true,
                    'hide_empty'   => true,
                )
                )
            );
    }
    if(!empty($cats_child_array)){
        return $cats_child_array;
    }
    return $cats_array;
},10,2);

Best regards.

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[DH Evanto]

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[DH Evanto]

Dear, If you want open description tab when load single product page. Please install and switch your site to use Urami Child theme. then add custom PHP code to file functions.php of Urami Child Theme:

add_action('wp_footer', function(){
   echo "<script>
    	jQuery(document).ready(function(){
    		jQuery('.product-accordion .accordion--description .accordion__item__header').trigger('click')
    	})
    </script>";
},99);

Best regards.

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[DH Evanto]

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[DH Evanto]

Dear, If you want display related product include from child category, Please add custom PHP code to file functions.php of your theme.

add_filter('woocommerce_get_related_product_cat_terms', function($cats_array, $product_id){
    $cats_child_array = array();
    foreach ($cats_array as $cat_id){
        $cats_child_array = array_merge(
            $cats_child_array,
            get_terms(
                'product_cat',
                array(
                    'fields'       => 'ids',
                    'parent'       => $cat_id,
                    'hierarchical' => true,
                    'hide_empty'   => true,
                )
            )
        );
    }
    return array_merge($cats_array, $cats_child_array);
},10,2);

Best regards.

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[DH Evanto]

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[DH Evanto]

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[DH Evanto]

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[DH Evanto]

Dear, I think that problem maybe conflict plugin on your site or your hosting not allow. Please deactivate each plugin to check. If it still not work. Please contact with your hosting support to help you.

Also, you can read this article to fix your problem.

Best regards.

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[DH Evanto]

Dear, Please kindly give me details your problem with page URL or screenshot. I will check details to help you.

Best regards.

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