title: Bootstrap 4 navbar-expand-[sm | md | lg | xl] not working
body: <p>We have a navbar generated from a controller (as we don't know how many links it will have, it has to be dynamic) and want to adjust the collapse point. In older versions of bootstrap it took a mammoth amount of javascript but I gather with version 4 we should be able to set using 'navbar-expand-*' but whatever this is set to is still collapses at 768px.</p>
  
  <pre><code>&lt;div class="navbar navbar-inverse navbar-fixed-top navbar-expand-xl" id="secureNavbar"&gt;
  </code></pre>
  
  <p>Any ideas?</p>
  
  <p>Thank you</p>