Next Button Disabled on Revisit

I am new to Articulate. A project I am working on requires the timeline restricted till slide media completes. I found the menu restriction very helpful. I am using inbuilt navigation rathe than create a custm button but the only issue is that the next button is still restricted upon revisit and not as Judy Nollet explained above. I wonder if I am doing anything wrong. I also noticed that the accessibility shortcut for "next" and "back" does not obey the menu restriction. Is there a way around this?

Thanks

I found help through this link: How to disable and enable next buttons - Articulate Storyline Discussions - E-Learning Heroes