Weekdays are days on which classes are planned for a batch. For a newly added batch, by default, Monday to Friday are set as weekdays. You can edit the default weekdays.
At the top of your dashboard, click the module access icon > Academics > Timetable > Set weekdays & class timing sets to open the Set weekdays & class timing sets page.
If you want to change the weekdays for a batch, select a course, and then select the batch and make the changes.
Note: You must select at least one weekday.
Click Change, and then assign a class timing set for each weekday.
Note: This field is available only if you mark student attendance Daily.
Click the Save button.
For more information, watch this-