Field in Field Collection not displaying

Running Drupal 7.59

I have added a field to a field collection using the Structure->field collections->(collection) menu 

I edited a page where the field collection is used, and added content to the field.

The new field is retained when I revisit the edit page, but it does not show up in the field preview, nor when I display the current page.

When I add a field to the structure, do I need to do something else to enable display?

I have no idea how to go about debugging this!

Drupal version: