then just to see what i mean,

1.- Log in as admin

2.- Go to the tree view of product categories,

3.- Set developer mode (admin -> about odoo)

4.- In the Debug View" dropdownlist, select "Edit Tree view

5.- Just before the line <field name="complete_name"/> crate a new line like: <field name="name"/>

6.- Save and close.

Now you have 2 columns in the tree view, just clik on the column name to order by.

The best way is to create a módule an inherit that view adding the field name, but this will work for you while you learn how to create a module and inherit a view.

Kind regards,