Find Internally Shared Google Documents

In Drive audit, we can see a nice overview of all drive files of your entire G Suite domain.

overview of all drive files in GAT+

An admin can select each of the categories and it will lead them to all the files from which the category was created from.
In this case will display all Google Drive files which are Open to internal users.
Sharing flags is set ‘Open to internal’, the users are in grey background color, which also indicates that the user are local and not from an outside domain.

Sharing flags tab in GAT+