Hi Romain 

let's see what we can do for you:

- where do you want to display the URL?

- displaying portfolio category column

go to /wp-content/plugins/bauman-functionality-plugin/include/custom-post-types-config.php

and 

add 'show_admin_column' in register_taxonomy() call

register_taxonomy( 'portfolio_category', 
'bauman_portfolio', 
array(
'hierarchical' => true, 
'label' => __('Categories', 'clapat_bauman_plugin_text_domain'), 
'query_var' => true, 
'show_in_rest' => true,

'show_admin_column' => true,
'rewrite' => true
));

let us know, if this work as it should we can include it in our next update

Np Romain, glad to help you.