How to make Bootstrap 'List group' responsive

You can do this with a bit of media query. In overiding the collapse class when the screen size is different of XS.

Bootply : https://www.bootply.com/L5BYCOwsZG

CSS :

@media screen and (min-width: 768px) {  
    .custom-collapse .collapse {
            display:block;
    }  
}

HTML :

<div class="custom-collapse">
  <button class="collapse-toggle visible-xs " type="button" data-toggle="collapse" data-parent="custom-collapse" data-target="#side-menu-collapse">
      <span class="">Toggle navigation</span>
      <span class="icon-bar"></span>
      <span class="icon-bar"></span>
      <span class="icon-bar"></span>
  </button> 
  <ul class="list-group collapse" id="side-menu-collapse">
    <li class="list-group-item dropdown-toggle">Cras justo odio</li>
    <li class="list-group-item dropdown-toggle">Dapibus ac facilisis in</li>
    <li class="list-group-item dropdown-toggle">Morbi leo risus</li>
    <li class="list-group-item dropdown-toggle">Porta ac consectetur ac</li>
    <li class="list-group-item dropdown-toggle">Vestibulum at eros</li>
  </ul>
</div>