Microsoft Forms will now show responders a progress bar on multi-page (multi-section) forms and quizzes, as long as if the forms owner enables the feature.
How does it work?
The progress bar improves usability by providing responders with a visual indicator of their status within the survey, e.g. “Page 1 of 3”.

Image is not our own. Image courtesy of Microsoft, taken from Message Center email: Major Change Update Notification.
You may want to update your internal guidance/help documentation if appropriate.
This feature is off by default on new forms and quizzes. Form owners can choose to enable/disable this optional setting.

Image is not our own. Image courtesy of Microsoft, taken from Message Center email: Major Change Update Notification.
Forms and quizzes at rollout will have the progress bar setting enabled. The progress bar feature is only shown on multi-page forms and can be easily disabled by the form owner in the settings pane for that form/quiz.