Please go to Dashboard -> Support -> Ticket List -> More Settings for more settings about ticket list. This will include below settings:

Default order by

As name suggest it is default ordering of the ticket list once loaded first time if no filters active. Once ticket list loaded, user can click on headers of the list which is applicable for ordering. This is available in Agent View and Customer View, you have to set it separately for them.

Number of tickets

You can set number of tickets shown per page in ticket list. This is available in Agent View and Customer View, you have to set it separately for them.

Unresolved statuses

You have to select statuses which you think shows ticket as unresolved. Selected status tickets will be shown as unresolved filter tickets as well as count shown in dashboard menu for unresolved statuses. For dashboard count, Agent View unresolved statuses matters.