You can override order_comments.phtml file using layout XML by creating a module or directly add template file to the theme level under Magento_Sales module.
order_comments.phtml file used to show the order comment in order details view page.
order_comments.phtml file is declared under the sales_order_view.xml file in Sales Module. Continue reading “How to override order/order_comments.phtml template in Magento 2?”