THIS IS RELEVANT TO CA2020 (TC, TPS AND TPE ONLY).
You are not permitted to use a second screen or a second device, irrespective of the configuration. Only one screen/device is permitted.
That screen must be the screen that is being shared with Proctorio and must be the one that has the webcam on it i.e., you cannot use the webcam on a laptop but be using a separate monitor to view the paper/type your response.
If you are identified as using a second screen or device it will be flagged to the assessment panel as a potential breach of regulations.