Sorry it’s not a very direct answer but this is one of the many things that make Emacs such a comfortable environment once you’re used to it, which takes … a while.
There is a man command and then of course it’s just more text displayed so you can search and narrow and highlight etc. in the same way you do with any other text. Plus of course there are a few trivial bonuses like links to other man pages being clickable.
It’s all text and Emacs is a text manipulation framework (that naturally includes some editors).