Drop this script into a tool like https://chrome.google.com/webstore/detail/custom-javascript-for-web/ddbjnfjiigjmcpcpkmhogomapikjbjdk to kill twitter garbage

kill-twitter-whats-happening.js

setInterval(function() {
  var heading = Array.from(document.querySelectorAll('h2[role="heading"]')).find((header) => {
    return header.innerText === "What’s happening"
  })
  
  var whatsHappening = heading && heading.parentNode && heading.parentNode.parentNode && heading.parentNode.parentNode.parentNode
  
  // Kill Whats happening garbage
  if (whatsHappening) {
    whatsHappening.style.display = 'none'
  }     
}, 2000)