from select picker in bootstrap 4 to bootstrap 5 code example

Example 1: bootstrap 4 selectpicker

<select class="selectpicker">
  <option>Mustard</option>
  <option>Ketchup</option>
  <option>Barbecue</option>
</select>

Example 2: bootstrap 4 selectpicker

$(function () {
    $('select').selectpicker();
});