Canvas includes a set of default notification preferences that you, as instructors, may set for your courses. These preferences only apply to you. You cannot control how others receive course updates. To learn more about each notification, default settings, and notification triggers, view the Canvas Notifications PDF.
The functionality does not exist today to allow faculty to see the notification settings of their students. Instructors must rely on assumptions about students receiving information from a course electronically. Some instructors want to know what the notification settings are and identify students that do not have certain ones turned on. This is controversial.
To read some of the pro and con arguments about viewing student notification settings as an instructor go here.