twist-threads.user.js

// ==UserScript==
// @name         twist-threads
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Move threads to the right
// @author       You
// @match        https://twistapp.com/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    var timerVar = setInterval (function() {
        let threads = document.getElementsByClassName("center_col")[0];
        if (threads.nextElementSibling)
            threads.parentNode.insertBefore(threads.nextElementSibling, threads);
        let msgs = document.getElementsByClassName("right_col")[0];
        var newDiv = document.createElement("div");
        newDiv.style.flex = "1";
        if (!msgs)
            threads.parentNode.insertBefore(newDiv, threads);
        }, 50);
})();