Solution - 1

are you using child theme? can you upload zip file of this plugin so I can have a look on code?

Solution - 2

Hello Cedlimed, Could you add this code into functions.php file and it will do the trick!

add_action('wp_footer', 'customFooterCodes');
function customFooterCodes(){
    
    if(! is_checkout()) return;
    ?>
    <script>
    jQuery('#wc-od').insertBefore('.order-total').wrap('<tr></tr>');
    </script>
<?php
}

Solution - 3

This is not an standard place for place it. Using PHP you should use some hooks to create a new place and some JS logic to show it. Using JS you can do it (but this is not so pro) moving from one element of the DOM to another one: https://stackoverflow.com/questions/1279957/how-to-move-an-element-into-another-element

Solution - 4

managed to find the hook in the plugin class-wc-od-checkout.php add_action( 'woocommerce_checkout_before_customer_details', array( $this, 'checkout_content' ), 99 );

Solution - 5

Is it possible for you to share plugin?

Solution - 6

You must use a JS only but if you want a PHP solution, you must edit to the core of plugin files