JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
    <li class="first_level" style="background-color: blue; padding:5px;">
        <span class="name">List Name</span>
        <ul class="tools"></ul>
        <ul class="sublist" style="background-color: pink; display: none;">
            <li>Subitem 1</li>
            <li>Subitem 2</li>
            <li>Subitem 3</li>
        </ul>
    </li>
</ul>

JavaScript

$(document).ready(function(){
   $('.first_level').dblclick(function(e){
        $(this).find('.sublist').toggle();
    }); 
});