Your Inactive Customers Report gives you a quick overview of customers who haven't ordered from you in a while. To view the report:

Step 1: Visit Dashboard > Marketing.
Step 2: Expand the Inactive Customers Report.
Step 3: Select the time period for which you want to view this report. You can access information on customers who haven't ordered in a month till up to 6 months.

Note: You can also export and download the report by simply clicking the export button on the top right. Access and download your exported report for a period of 7 days by selecting Saved Reports.