Talking quietly on the non-talking, quiet library floor.. is it rude to ask people to stop talking?

I HATE when I’m studying on a non-talking quiet floor at the library and people come over and start having a full on conversation just at a low volume.

Is it unreasonable to ask them to stop talking when theyre only talking quietly? It is a non-talking floor but idk if thats overdramatic or rude of me??

ALSO.. (unrelated library complaint) but WHYYYY do people sit extremely close to others when there are other spaces open???? Like a man just pulled up a chair directly behind me (not at a desk) to reach the outlet. I got up and there was another seat open right across from us??? I moved all my stuff over there.