You can search a contact scrolling the list with the arrow keys or using the Quick Find search field.

Custom Search

A Custom search and sort order is available selecting the right button on the search field.
Here you can change the the way as the contacts will be found and sorted.
Es. if you choose “Company” in the left field and “Surname” in the right field then click the apply button, the sort order will change to  Company-Surname, and you can search by Company name.