CSSでこれを隠すことは可能です:<a data-toggle="collapse"></a>
最初は隠さずに<a>
?ちょうどCSSで?CSS非表示のデータトグル
<a href="edit.html">
<i class="pull-left fa fa-lg fa-calendar-plus-o" aria-hidden="true"></i>
</a>
<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.6.3/css/font-awesome.min.css" rel="stylesheet" integrity="sha384-T8Gy5hrqNKT+hzMclPo118YTQO6cYprQmhrYwIiQ/3axmI1hQomh7Ud2hPOy8SP1" crossorigin="anonymous">
<li>
<a href="edit.html">
<i class="pull-left fa fa-lg fa-calendar-plus-o" aria-hidden="true"></i>
</a>
<a data-toggle="collapse" data-target="#collapse" aria-expanded="false" aria-controls="collapse" class="">Collapse</a>
</li>