If you have a double or duplicate lesson this quick article will show you where to find this on your school site.
To find your timetable lesson, go to School > Timetable. From the left-hand menu, click Lesson Timetable (list). You will need to select the filter bar at the top of the page.
Once you have clicked into the filter select the day you need to look at. Make sure you select the start and end date to be the same so the filter will only pull through one day's worth of timetabled lessons.
Here you will see the lessons that are taking place on the day of your filter and you will be able to identify any double/duplicate lessons.
If you need to remove duplicate lessons, you'll need to follow this article: Editing timetable slots, lesson times, rooms and staff