How can I change the minimal Idle time

You can allow the employee to think about the task, watch a video, do industrial gymnastics, or go to the toilet. These short pauses will not be included in the IDLE time.   You can change the length of this allowed pause on the Settings page separately for each department. To configure this option, change the value in the “Minimal durability of idle time (sec)” field. Save the settings and restart the target computers.