Short answer: Yes. Teachers can review Canvas quiz logs for attempt timelines, answer saves, timestamps, and focus-loss events.
What teachers see
They see entries such as quiz started, question answered, stopped viewing, resumed, and submitted. They do not see a screen recording from Canvas alone.
What makes a log suspicious
Repeated long focus-loss entries, sudden answer changes after being away, and patterns clustered around hard questions are more concerning than a single quick tab switch.
Use the Quiz Log Risk Analyzer or read Canvas Quiz Logs Explained.