How to hide/show hidden lessons?

In order to hide or, conversely, display canceled lessons in the calendar (attendance book), you need to:

1. Go to the “Attendance log” section.
2. Click on the filter icon in the upper left corner.
3. Click on the slider next to “Canceled lessons” to turn it orange.
4. Now you will see pale gray crossed out lessons in your schedule – these are the previously canceled lessons.
5. In order to hide canceled lessons again, click on the orange slider so that it becomes gray again, inactive.

Video explanation: