With the AODocs Smartbar installed, library administrators can prevent contributors from modifying the sharing permissions of files and subfolders.
Learn more here: Install the AODocs Smartbar.
1. In the Google Drive interface, open an AODocs library where you are defined as an library administrator.
2. Click on the gear icon and select Security center.
3. In the Security center window, select the Security tab.
4. Check the checkbox Only administrators can share files and folders.
5. Click on Done to save.
Note: You may experience some delay to see the changes applied because AODocs needs to update the Google Drive permissions on every file in the Team Folder or Secured Folder. For example, for a library with thousands of documents, it can take several hours before the change is fully effective.