You can see every lesson your customer has viewed or hasn't viewed:
Under any customer’s profile, click on the progress bar to see every lesson they’ve viewed.
Here are the steps:
Step 1: Click on Customers
Step 2: Search for your customer's email address
Step 3: Scroll down to the list of products your customer has access to
Step 4: Click on the progress bar or click the three dots to "View progress..."
Want to see it in action?
Here’s a video link: https://www.dropbox.com/s/macq01prmob18o6/podia-view-progress.mov?dl=0