How do you still manage the meeting as a non-chairman?

Meeting workshops mainly teach you how to lead strong meetings as a chairman. How to build structure. How to keep everyone talking or talking. How to deal with difficult participants. But what if your chairman himself is a difficult participant? So I often get the question yes, but how can I, as a non-chairman, ensure that things go more

Choose one very effective and practical tip that you can apply immediately to your next meeting, in the very short blog how, as a non-chairman, still influence the meeting?