"Allow user to drag seekbar" and "Free" navigation restrictions behave the same. Learners can skip forward and back at any time.
"Restricted" navigation allows "free" navigation on material already viewed. Good enough.
"Seekbar is read-only", unlike "restricted" navigation, prevents a learner from unrestricted seeking on previously viewed slides.
That's the implementation. Is everyone good with this or should the seekbar behave like restricted and allow free seeking on previously viewed slides?