Data Import Wizard: External IDs, Search, and Other Enhancements

You can now select specific External IDs, choose from multiple field separators, and search which fields to map when you import with the Data Import Wizard. We also changed the way the Data Import Wizard handles invalid field values.These changes apply to both Lightning Experience and Salesforce Classic.
Available in: Group Professional Enterprise, Performance, Unlimited, Developer, and Contact Manager Editions
Your edition determines the types of objects you can import.