CB

Implement a check to see if the tab the field is on is unpublished so when editing a field you'll know for sure it won't be visible due to its tab being unpublished. The coloring in CB > Field Management for tab title could also be bolded to make it stand out more as well.

https://www.joomlapolis.com/forum/146-general/237386-email-field-not-showing-in-registration-form