Just block out the rest of your day and auto decline meetings. I do that and it works great. Forces everyone to schedule everything before noon. Also make sure

Just block out the rest of your day and auto decline meetings. I do that and it works great. Forces everyone to schedule everything before noon. Also make sure to schedule lunch in as well. It make sure you auto decline that’s the trick. If you’re manually approving/declining each one you’ll end up allowing some which signals the blocked out time isn’t that blocked out to the rest of the team.