To track attendance for a section, the section must have a schedule and "Track Attendance" must be enabled. Your section records can be found in Other > Listings > Sections. After you save the record with this box checked, a new "Attendance" tab will appear along the top of the page.

Within the attendance tab you will find your class attendance table. This will show each student registered in the course and their class attendance for each day of the section schedule. By clicking the day header at the top, you can make batch changes to all or all unset records at once for that day. An efficient workflow in this interface may be to mark the absences first, and then mark the remaining unset students as attended.
File:2025-02-12 08-58-21.mp4