JSFiddle - React, Tailwind, and code Playground

HTML

<div class="menu-block-wrapper menu-block-3 menu-name-main-menu parent-mlid-0 menu-level-2">
  <ul class="menu"><li class="first last expanded active-trail menu-mlid-714"><a href="/how-it-works" class="active-trail"><span>How It Works</span></a><ul class="menu"><li class="first leaf menu-mlid-526"><a href="/how-it-works/purchasing-power-values-and-benefits"><span>»</span> Values and Benefits</a></li>
<li class="leaf menu-mlid-522"><a href="/how-it-works/about-our-pricing"><span>»</span> About Our Pricing</a></li>
<li class="leaf menu-mlid-528"><a href="/how-it-works/take-tour"><span>»</span> Take the Tour</a></li>
<li class="last expanded active-trail menu-mlid-1924"><a href="/how-it-works/financial-wellness" title="Improve Your Financial Wellbeing" class="active-trail"><span>»</span> Financial Wellness</a><ul class="menu"><li class="first last expanded active-trail menu-mlid-1929"><a href="/how-it-works/financial-wellness/articles" class="articlesLink active-trail"><span>»</span> Articles</a><ul class="menu"><li class="first leaf menu-mlid-1931"><a href="/how-it-works/financial-wellness/articles/6-steps-to-better-understanding-your-credit"><span>»</span> 6 Steps To Better Understanding Your Credit</a></li>
<li class="last leaf active-trail active menu-mlid-1932"><a href="/how-it-works/financial-wellness/articles/how-to-create-a-spending-plan" class="active-trail active"><span>»</span> How To Create A Spending Plan</a></li>
</ul></li>
</ul></li>
</ul></li>
</ul></div>

CSS

.hideChild .menu{background:red;}

JavaScript

$(function(){
  $('.articlesLink').parent('li').addClass("hideChild");
})