Remove sidebar right

You can remove the Right Sidebar element directly from the html structure (am-right-sidebar), you'll find it inside the main wapper, also you should remove the sidebar toggle button (am-toggle-right-sidebar) from the top header, once they are removed your main structure should look like this:

<html lang="en">
  <body>
    <div class="am-wrapper">
      <nav class="navbar navbar-default navbar-fixed-top am-top-header">
        <!-- Top bar without sidebar toggle button -->
      </nav>
      <div class="am-left-sidebar">
        <!-- Left sidebar -->
      </div>
      <div class="am-content">
        <!-- Main content -->
      </div>
    </div> 
  </body>
</html>