...

When the value is ON, the employee personal information entered in EBI activity will be populated in I-9 Section-1 and the fields in I-9 Section-1 will be read only. 

Example of New Hire's EBI

...

activity:

 Candidate information entered in EBI is auto populated in I-9 Section 1:

How to change the value of I-9AutoFill property?

...