Q: Is there way to easily find out which of my classes has low enrollment or low remaining seats?

To see which Events haven’t sold enough seats, you can use the Display Options under Event Management.

To do this, go to Store > Events > Event Management.
On this page, click More Options > Display Options.

You’ll see a setting for Sold Seats (or Available Seats), with a checkbox to Indicate when number is:, with a dropdown.

Once the value is selected, the Event Management page will now indicate your setting with a highlight.