giving specific maximum time for each person to speak. because when one person speaks for 10 minutes, the other one has 2-5 minutes. if there are some individual questions that don't involve everyone, they should be addressed after the meeting, not during it, but that is just my personal opinion. that way, we would keep the session more focused. i had a feeling in some meetings that time was a little bit wasted. also, people need to be prepared before the meeting about what to say, so it is only the most important things.
maybe ask the team to fill in the goals before the sprint planning session. just to have the session itself for various questions, discussions, and overall analysis of the team goals.
a bit more depth - i would suggest for sm to try to be more focused and listen to the one who's talking more, provide suggestions and reflect, not only to be a passive listener. also, in the sprint retrospectives, i would suggest reflecting deeper into the team's insights and providing even deeper actions.