Does anyone know how to turn on the progress marker I have highlighted in this screenshot?
This feature is available in the New Learner Experience when using the New Content Experience (Lessons). Both of these are to be enabled through the Config Variable Browser. These settings are typically set/managed by your institutions Brightspace Administrator.
For additional information see:
The relevant content configuration variables to enable the New Learner Experience and the New Content Experience (Lessons) are covered in
Hope that helps!