Show More "recent Orders" On Admin Homepage

Is there a setting I can access via an ftp file where I can change the amount of orders listed on my admin's homepage under recent orders - All?

It currently shows 5, but I'd like to redesign the index page to show more orders - like 25. A couple of the other tables are not needed, and will be removed.

Ultimately I'm looking for a file location. So far I have not been able to find the correct file to alter.

Many thanks!