You'll see that scrolling through the names changes the detailed information shown in the white boxes to the right.

My name is in blue, because I've designated myself as staff.  The green flag to the right of the email address indicates that I've marked this shooter as a qualified safety officer.

The tabs at the top of the screen let you sort shooters by first or last name, last shoot day, last Classifier, and whether they are safety officers.  You can also sort them by IDPA number or alphabetically by email (useful when an email you send to wizbangcdp@bogus.com bounces and you want to find out who that is.)

If you exit the program with First Name selected, the next time you run it the software will remember your choice.

There's a more detailed explanation of this screen later in the documentation.