HappyFox allows you to set the number of tickets you want to view in a page. 

The default number of tickets displayed in a ticket list is 10, and can be increased up to 50 tickets per page.

To modify the number of tickets you wish to have on your ticket list, log in to your agent account and click on My Settings (link at the top right corner) >> Ticket Preferences and select the number of tickets from Tickets per page.  Once you've made the changes, click on Save.