You're looking in Course admin > reports > activity completion.
General help
How do I do complete/not complete in reports?
གྲོས་བསྟུན་འདི་བསྡམས་ཡོདཔ་ལས་ ལན་གསལ་བརྐྱབ་མི་ཚུགས་
You're looking in Course admin > reports > activity completion.