The Returns Report will show you the Returns created over any specified period of time. This report is for Returns Orders, not RMAs. Return Orders are for items that are returned in person, immediately. For more on Returns and RMAs, see here. There is a separate report for RMAs.
You can also filter by Location, Origin (Ecommerce, Admin, Retail, Amazon), and/or the User that created the Return. Once you have entered all the desired parameters, click Submit to generate the report.
You can see a brief overview of the information at the top of the Report and peruse results in Cohub, or export as a CSV or Excel file to view/edit externally.