Due to how smartsheet handles seat licensing when publishing 'read only' reports they add CSS/JS to prevent selection of text or right-clicking on the page. This seems too restrictive so using this script in conjunction with Tampermonkey should enable this behavior again.

smartsheet.user.js

// ==UserScript==
// @name         Smartsheet - Enable text selection and context menu clicks
// @version      1.1
// @author       lamchau
// @description  Enables text selection and context menu clicks from published Smartsheets
// @updateUrl    https://go/smartsheet-hack
// @match        https://app.smartsheet.com/b/publish?*
// @icon         https://www.google.com/s2/favicons?domain=smartsheet.com
// @run-at       document-end
// ==/UserScript==

(function () {
  // extracted from: https://alanhogan.com/code/text-selection-bookmarklet
  'use strict';
  const style = document.createElement('style');
  style.type = 'text/css';
  style.innerHTML = `
 *, p, div{
   user-select:text !important;
   -moz-user-select:text !important;
   -webkit-user-select:text !important;
 }`;
  document.head.appendChild(style);
  const enableRightClick = () => {
    if (document.oncontextmenu) {
      document.oncontextmenu = null;
      clearInterval(pollForContextMenu);
    }
  };
  const pollForContextMenu = setInterval(enableRightClick, 50);
})();