Hi Julie,
From a similar post answered by Sharon Zhao-MSFT:
If you are the global admin or Teams admin, you can go to Microsoft Teams admin center > Meetings > Meeting policies > Content sharing > Turn off “Allow a participant to give or request control”.
This setting is a per-user policy. You can assign this policy to individual student or large sets of users.
For more details about Teams policies for Education, you can refer to this link: https://learn.microsoft.com/en-us/microsoftteams/policy-packages-edu.
If this is helpful please accept answer.