The attendance report is a summary of the already saved attendance records for a period: who attended, who was online, who was absent, and who was working. It is not a live attendance screen.
To open the attendance report, go to "Reports" → "Attendance" (or the school control panel → "Reports" block → Attendance). Set the period and switch between status tabs with counters: present, present online, absent, work-in, worked. The table shows the student, course, lesson, and lesson date.
To track attendance "here and now", use the Attendance tool.