It's awful, someone make it stop 😔 How do I turn it off?

I can no longer go straight to the end of a long thread. I can no longer use "find in page" to find things. I can no longer load a few long threads to read on the underground. It's absolutely rubbish.

Can I have my MN back to just showing me all the posts on a thread please and thanks?

(And no, I don't want pages, that's why I didn't have pages set in the first place)