To see a list of students' attendance by Lesson/Period. E.g Year 11, Period 1, go to Students > Attendance > Bulk Edit Marks. You can see more details on using these pages here: Bulk editing attendance marks
In the filters at the top of the page, you can choose the date range and the student group.
You can then see and edit the Attendance marks for the period you want to look at, or Download the report to use outside of Arbor.