When does the progress bar work?

I’m new to this and I’m having problems with the progress bar. I’m not sure if I’m playing or if I’m still in some sort of tutorial. Any ideas?

Hi, if you’re seeing the progress bar you’re still in the tutorial.  What sort of problem are you having with it?

The progress bar does disappear 2/3s of the way through the tutorial.  When you are working on the actual cells, we won’t have the correct answer available, so you are on your own.  We try to wean you off the training wheels as we go.