Webi know at least during a quiz/test/assignment, canvas monitors all your activity on that tab.
Which question you look at, which answer you selected, etc.
Also if you change tabs or windows.
Everything is time stamped.
So to answer your question, yes. 😬 edit:
Websep 17, 2022 · can teachers see when you open or switch tabs during canvas quiz?
Webif you check out the quiz log history you’ll see the two major ‘cheating’ countermeasures are inactivity and and window/tab selection.
It cannot tell that you specifically split screen.