Ubercart 3.x catalog page (terms categories) theme?
I not sure if you are referring to a taxonomy term page. In case if you are then please follow below mentioned steps:


Go to: admin/structure/views
Find a view called: Taxonomy term
Edit this view and add the fields as you wish
Under 'FORMAT' change to table, etc will change the overview of the taxonomy term page.


By modifying this view you will be able to change the layout, and the add more fields to the page.

Note: changing this view will change all the taxonomy term pages.