This is something I've very consciously tried to be correct my behavior on. It's unfortunately and surprisingly hard to just shut up and let someone finish, but I've gotten a lot better at it. Now I find myself nodding and physically moving, ready to jump in the moment I can. I work with one guy who is the worst at this. You can be in the middle of a sentence telling a story, and he'll hijack it and pivot. He then will ramp up his volume as he talks to control the convo. It's annoying, but I can empathize with him to an extent, and I don't think he knows he's doing it. It's a tough line to walk sometimes.