Message after exam

After student ends a timed exam, he gets text message “You have submitted your timed exam.” (or similar if time has passed).
There is no “next” button or other action component. The only way to navigate is to click breadcrumbs “Course” link and then find next subsection in the outline.
It’s obviously breaking the pipeline and putting the student in kind of dead end.
How can I edit this message, or change something else in order to to take student to the next subsection seamlessly?
Thank you.