View Multiple Contacts

In Mac Contacts you select a name on the left and then view the contact information on the right. If you ever want to view more than one contact at a time, use Card, Open In Separate Window or Command+i. This opens the contact in a new window and you can continue to view other contacts in the main window. You can open as many of these windows you as like. You can even select multiple names and use Command+i to open them all at once.