Attendance summary provides you a summary of all tracked hours under People -> Attendance summary. Once activated, you can also review the status of overtime and tracked locations with the summary. 

Once you enable the Attendance module under Settings > Features > Attendance by clicking the toggle button to the right, you will be able to enable Attendance tracking. 

As an admin, you can enable the feature from the Settings section. 

1. Go to Settings -> Features -> Attendance 

2. Click on Settings

3. Under General, toggle the Attendance summary button to enable the tracking 

Note: If you activate the attendance tracking here, it will be activated for all employees. If you want to enable the attendance tracking only for individual employees, you can do this in the employee's personal profile.