At my university, exams take place in a lecture hall, but it is usually pretty packed. Along with alternating versions of tests, it is pretty easy for a student to look to the next row or their neighbor for inspiration.
How do you confront a student with a wandering eye? I do not want to embarrass the student or distract others during the exam, but I also want them to know that it is not okay to do. In the past, I would usually tell the student to keep their eyes on their own exam. There have been cases where the students with wandering eyes are just spacing out.
I have asked instructors at my university and they tend to just ignore it and not say anything.