JSFiddle - React, Tailwind, and code Playground

HTML

<select id="ddlMylist">
  <option value="10">Choice 1</option>
  <option value="20">Choice 2</option>
  <option value="30">Choice 3</option>
  <option value="40">Choice 4</option>
</select>

JavaScript

document.getElementById("ddlMylist").onclick = function(){
  document.getElementById("ddlMylist").selectedIndex=-1;
  }