Rakesh Jesadiya

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.

You can check the customer is logged in or using knockout javascript in Magento 2 by using the Magento_Customer/js/model/customer class.

customer.js file used to check customer is logged in or not.

Customer Js file contains the method isLoggedIn() to detect customer login status.

You can override recent.phtml file using layout XML by creating a module or directly add template file to the theme level under Magento_Sales module under the theme.

recent.phtml file used to show recently placed orders, on My Account Dashboard for registred customer with Section Name, Recent Orders at bottom of the page.

recent.phtml file is declared under the customer_account_index.xml file in Sales Module.