How to add orderby parameter for sorting on category.php

by

You can use the pre_get_posts action hook to set the order on your category archive like so:

add_action('pre_get_posts', 'filter_category_orderby');

function filter_category_orderby( $query ){
    if( $query->is_category()){
        $query->set('orderby', 'title');
    }
}

just paste this snippet in your theme’s functions.php and you should be fine.