functions.php

// View Order Thank You page.
add_filter( 'woocommerce_order_actions', 'show_thank_you_page_order_admin_actions', 9999, 2 );
 
function show_thank_you_page_order_admin_actions( $actions, $order ) {
   $actions['view_thankyou'] = 'Display thank you page';
   return $actions;
}
 
add_action( 'woocommerce_order_action_view_thankyou', 'redirect_thank_you_page_order_admin_actions' );
 
function redirect_thank_you_page_order_admin_actions( $order ) {
   $url = $order->get_checkout_order_received_url();
   add_filter( 'redirect_post_location', function() use ( $url ) {
      return $url;
   });
}