Back-Office Customization
Oro application back-office is a single-page application (SPA) with a mix of server-rendered content with Twig templating engine and client rendered content with Underscore.js. You can customize it with themes, override SCSS Styles, Twig, and Underscore.js templates and extend parts of a page with placeholders.

This tutorial describes how to customize OroPlatform layout and OroCommerce back-office layout.