By default, permission is set to Trusted Sharing. This article aims to guide you on how to set Limited Sharing. This can only be performed by district admins.
Step By Step Guide
1. Click on School Site List from the Toolbox section
2. On the next screen, click on Edit School Settings
3. Set Document Sharing Permissions to Limited Sharing using the Change button
Please refer to Document Sharing Permissions - Introduction for a complete list of what to expect after setting the permission to Limited Sharing.