SharePoint (macOS) – Manage File Access in Finder
You can view and manage who has access to your files on SharePoint.
Open Finder and go to the file you would like to manage access to.
Press and hold control+click on the file and from the pop-up menu click Share.
Screenshot of Share option
From the share box that will appear click on the Ellipsis.
Screenshot of Ellipsis option
In the action-box click Manage Access.
Screenshot of Manage Access
Click on the Can view under the person's name, you want to modify permissions for.
Screenshot of Can view permissions