How to remove icon on website added in pageheader code injection?

Edit your code

Search tool//
<script src="https://code.jquery.com/jquery-3.5.1.js"></script>
<script>
  $(function(){
  let searchBlock = $('#block-yui_3_17_2_1_1599758294021_21592')
  .attr('id', '')
  .addClass('header-search-bar');
  
 $(searchBlock).insertAfter($('.header-actions-action.header-actions-action--social'));
  $(searchBlock).clone().addClass('mobile-header-search-bar').appendTo($('.header-menu-nav-folder-content'));
  })
</script>

to this

<!-- Search tool -->
<script src="https://code.jquery.com/jquery-3.5.1.js"></script>
<script>
  $(function(){
  let searchBlock = $('#block-yui_3_17_2_1_1599758294021_21592')
  .attr('id', '')
  .addClass('header-search-bar');
  
 $(searchBlock).insertAfter($('.header-actions-action.header-actions-action--social'));
  $(searchBlock).clone().addClass('mobile-header-search-bar').appendTo($('.header-menu-nav-folder-content'));
  })
</script>