Remove sidebar right

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

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