Copied from Reddit, of particular note for screen reader users as YouTube's shorts player is basically trash.

YouTube's "shorts" player removes a significant amount of functionality, especially the ability to jump forward and back in the video. Every video that loads in the "shorts" player is actually a regular video under the hood, and by slightly changing the URL you can get the same video to load in the regular player along with all of the functionality it allows.

To do this, look in the URL bar of a video playing in the "shorts" player, where you should see the text shorts/. (That is, the word "shorts" followed by a single forward slash.) Replace that text with watch?v= and load the new URL. (That is, the word "watch" followed by a question mark, letter v, and equals sign.) The same video should appear in the regular player.

As a concrete example:

https://www.youtube.com/shorts/SXHMnicI6Pg

becomes

https://www.youtube.com/watch?v=SXHMnicI6Pg

Hope this serves you well.

Source: https://www.reddit.com/r/YouShouldKnow/s/MicDN7io2u