Change Google Drive Sharing Permissions
***Prevents Editors from changing permissions & adding new people to the document.
Open the Google fil/doc that you want to share
Click the Share button in the top-right corner next to your Google Account
Click the Gear Icon in the upper right corner of the SHARE window
You can uncheck the permissions, you will get a popup saying “Setting updated”
Click the arrow on the left to go back & add users/students to the shared file