When you add a new schedule to your classes using the three-dot icon in the upper-right corner and selecting to "Add Schedule", you'll see a message
appear, asking when you would like the schedule to take effect.
If this message was closed or not adjusted, you may not see the
changes appearing on the correct days.
To adjust this, open your Classes page and then open a class. Here, adjust the times for the schedule you wish to edit and then save the changes.
Please note: changing the class start/end dates of the class will cause lessons
to be removed/shifted. These should not be adjusted.