Review the sharing access shown in Manage access. If access is broader than needed, update or remove the access.
Anyone access
If you see Anyone with the link can view or a similar Anyone link, the file may be accessible to anyone who has the link. If this level of access is not required, stop sharing and share again using Specific people or People you choose.

People in Florida Atlantic University access
If you see People in Florida Atlantic University, anyone at FAU with the link may be able to access the item. If this is broader than intended, remove that link and share again using Specific people or People you choose.

People in Florida Atlantic University and Direct Access
A file may be shared in more than one way. For example, it may have both a broad People in Florida Atlantic University link and direct access for specific users. In this situation, consider removing the broader FAU link and keeping direct access only for the people who still need access.

People you choose access
If the file was shared using People you choose or Specific people, you should see the people who have access. You can use the dropdown or access menu to review or modify their permissions.
