Currently, the best you can do is change your page size options for contacts to be "100":
Options > Address Book, and change "Number of contacts to display per page" value to "100".
This will show 100 contacts per page in the listview/cardsview when viewing the Address Book app.
As for the address picker (the widget that comes up when you hit the "To:" button in compose), you can only search at this time. There is currently an RFE already filed for this:
http://bugzilla.zimbra.com/show_bug.cgi?id=8133
Feel free to vote for it!