Microsoft Streams sorts videos by Trending, but lessons are easily found if sorted by Publish Date. This script authomatically selects this latter option.

MicrosoftStreamSortByDate.user.js

// ==UserScript==
// @name     MicrosoftStreamSortByDate
// @include  /^https?://web\.microsoftstream\.com/group/.*\?view=videos$/
// ==/UserScript==

/* Use this script to sort videos
 * by Publish Date automatically
 * on Microsoft Stream.
 * Inport this script in GreaseMonkey
 */

async function sortByPublishDate() {
  // find the selector class element and expand
  selectors = document.getElementsByClassName("selector");
  while(!selectors.length) {
    await new Promise(resolve => setTimeout(resolve, 500));
    selectors = document.getElementsByClassName("selector");
  }
  
  // click to expand options (seems silly but it didn't work without expanding)
  selectors[0].click();

  // find sort by Publish Date option and trigger click
  await new Promise(resolve => setTimeout(resolve, 500));
  items = document.getElementsByClassName("option-item");
  items[3].click();
  
  console.log("Videos Sorted by publish date!");
}

sortByPublishDate();