If you are a Thread user with access to the Team Management, you will see the Audit Logs page where you can view changes made by all users in your firm to matters, contacts, and more. You will also be able to view all users log in/out time. 

On the left menu, click on Audit Logs under the Team Management in the Settings. 

You will be seeing all audit logs in the last 7 days by default, but you can further filter by (1) log type, (2) user who made the changes and (3) time period. Click on Search button to apply the filters and view audit logs results. To view more details for each log, click on the (4) eye icon under the Descriptions column.