Check if the "cnp" field exists in the model. If so, you know that at least the module is installed. If not check that the status is "Installed" and not something like "Pending" or "Updating".

If the "cnp" field does exist, check if you're correctly referencing the view file in the manifest https://www.odoo.com/documentation/18.0/developer/tutorials/define_module_data.html?highlight=manifest#data-declaration