How do I get complete email addresses to show?

How do I get complete email addresses to show?

I opened a free personal Zoho email account and am concerned that when I enter an email address in the "To", "CC", fields, it changes to a simple first name. This might work well for most people however I do need to see the actual email addresses showing before I can send my messages.

Is there something I can do to fix this "feature"?

Thanks,
JB