The inactive user report will give you a list of users who have not made a Submission over a 30 day period or smaller range. This is great for tracking your GoCanvas usage. You can locate the Inactive User Report by navigating to Account>Reports and clicking on Inactive User Report.
Select a date range for the report.
The View option will give you a web view of your data including the ID, Last Name, First Name, Email, and Last Synced At date for your users.
The Export option will download a CSV file with your data that you can open in a program like Excel.