Hi 985706039
If you've set up an assignment so that Canvas assigns peer reviews automatically, it assigns each one at random and not in matching pairs - that is, if student A is reviewing student B's submission it doesn't necessarily follow that student B will be reviewing student A's submission. If you have an odd number of students it will assign the reviews so that each student is given a different submission.
Imagine a simple scenario where there are 3 students on the course: John, Dave and Anne. Canvas might assign the reviews like this:
John reviews Dave's submission
Dave reviews Anne's submission
Anne reviews John's submission
That way every submission is reviewed by someone and each student gets a different submission to review.
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