select2/docs/_includes/options/selections/clearing-selections.html

<section>
  <h2 id="allowClear">
    Can I allow users to clear their selections?
  </h2>

  <h3>
    The "x" icon is not clearing the selection
  </h3>

  {% include options/not-written.html %}

  <h3>
    Can users remove all of their selections in a multiple select at once?
  </h3>

  {% include options/not-written.html %}
</section>