Legacy saved reports
Legacy saved reports are available to all stores on the Shopify Plus plan. They are also being gradually released to stores on the Shopify and Advanced Shopify plan.
Previously you could create reports based on Product sales and Order sales. Those reports are now combined in the Sales reports. If you saved Product sales or Order sales reports, then you can still see them on the Reports page in your Shopify admin. They appear in the Legacy saved reports section:
You can click on a legacy saved reports to view it:
You can't modify the reports that appear in the Legacy saved reports section. If you want to duplicate a legacy saved report, then you need to create a new report with the same values on the Reports page in your Shopify admin.