JSFiddle - React, Tailwind, and code Playground

HTML

<select name="Zakaz[status]" id="zakaz-status">
  <option value="3">Дизайнер</option>
   <option value="4">Мастер</option>
    <option value="8" selected>Аутсорс</option>
</select>
<select name="autsors" id="autsors-select">
<option>Выберите партнера</option>
<option value="1">Привет</option>
<option value="2" selected>Мир</option>
</select>

JavaScript

//
document.querySelector('#zakaz-status').onchange= function() {
document.querySelector('#autsors-select').hidden= !(this.value === '8');
}