Hello,
I didn't do any customization, it's raw from Cassioppia. Just decorative CSS, I did the test anyway without the user.css
I found a parameter with the choice of invoicing or delivery, it is in the section main / Taxes / type of address for taxes. I don't know if that's the one you're talking about? this parameter was on billing. On "delivery" nothing changes, the delivery addresses still do not appear in the basket.
If not, I should place the site on a remote server for you to take a look.
Thanks