Clicking on the countdown timer icon (shown above) opens the exercise panel. It allows teachers to set a time frame for any task assigned to a student or student group.
You can set any time-frame you like and choose a group where the timer will start. The countdown will then be visible to all participants in the group. It works like a countdown watch or an hourglass:
Note that the exercise panel works independently for every group in case there are multiple groups in the classroom. Therefore, you need to set up a timer for each group individually.