A userscript that prevents tio from text wrapping, and provides a scrollbar instead.

tiotext.js

// ==UserScript==
// @name     tio text
// @version  1
// @grant    none
// ==/UserScript==

window.addEventListener('DOMContentLoaded', (event) => {

	var  textA = document.getElementsByTagName("textarea");
  for(var i=0;i<textA.length;i++){
  	textA[i].wrap = "off";
    textA[i].style.cssText = "overflow: scroll !important;";
  }
});