What occurs when a Canvas is stopped?

When a Canvas is stopped, users currently waiting to receive messages will exit the user journey. This means that any automated messaging or actions that were planned for those users will no longer take place, effectively removing them from the workflow and preventing them from moving forward in the journey that the Canvas was designed to manage. Therefore, stopping a Canvas will directly impact users who are in the midst of that automated process, ensuring they are no longer subjected to further automated messages or actions that were set to occur as a part of that journey.

In the context of the answers provided, the other options do not accurately reflect the outcomes associated with stopping a Canvas. For instance, while users may be prevented from entering a Canvas, that scenario is contingent on the specific stopping conditions and is not a direct consequence. Non-email canvases will indeed stop any further message sending, but this outcome is more general and does not address the specific user experience when a Canvas is stopped. Meanwhile, the delivery of messages queued in SendGrid goes beyond the Canvas operation itself, showing that queued email actions may still proceed independently of the Canvas status.