Hi @2983hf ,
I just setup last passbolt CE on an Ubuntu server 20.04 with the package.
I put the config at the bottom of /etc/passbolt/passbolt.php, in the passbolt section, under the ssl thing:
I saved the file, no need to reload nginx as it is just a PHP file.
After doing this, import/export buttons are unusuable:
Cheers,