[CustomPress] CPT hierarchy not working

Dear support team,

I've created a CPT that is supposed to be hierarchical :

https://i.postimg.cc/D0sKwnHV/2.png

However, on the edit page, I haven't got any options to select a parent-page. For instance : https://beta-presse.cf/wp-admin/post.php?post=87&action=edit

https://i.postimg.cc/SQ808QT3/2.png

How may I solve this ?

Regards,

Greg