discourse/app/assets/javascripts/select-kit/addon/templates/components/multi-select/multi-select-header.hbs

<div class="select-kit-header-wrapper">
  {{#each icons as |icon|}}
    {{d-icon icon}}
  {{/each}}

  {{multi-select/format-selected-content content=selectedContent selectKit=selectKit}}

  {{d-icon caretIcon class="caret-icon"}}
</div>