Finding Out Who A Report Is Shared With
You can find out who a report has been shared with by adding a column to a new or existing view, or on a report.
You can view the steps on how to create or customize a view here:
Creating and Customizing Views
Once in a Column Preview section, you can add the following column:
Report >> Shared With
Once you open a view with this column, or run a report with this column, you will be given a list of all users and teams that are shared on each report.