Redwood Employee Search Sort by 'Relevance'

Summary:

What does Order by 'Relevance' mean when searching for Employees in payroll redwood pages?

For example we have enabled the Payslip Dashboard and there seems to be no logic behind which employees appear at the top of the list when ordered by 'Relevance' which is the default.

Content (please ensure you mask any confidential information):

Navigate My Client Groups → Payroll → Payslips

What criteria does the below Sort By use?