Signature requirements are only available in the United States and Canada. The signature requirement can't be changed for orders that include a Pixel Fold.
Within the first hour after your order is placed: You can change the signature requirement.
If it’s more than an hour after your order is placed: The signature requirement can’t be changed, even if you contact Google Store support. You may be able to request a delivery carrier to hold your package at a local location so you can pick it up.