Hi there, @ECE.
To enable the Same as billing address option be automatically checked. You'll need to turn on the Shipping option in the Accounts and settings.
Here's how:
- Click the gear icon and choose Accounts and Settings.
- Select the Sales menu.
- From the Sales form content field, tick the pencil icon and put a checkmark in the box besides Shipping.
- Hit Save and done.
Once finished, open a customer's profile, click Edit and tick the box for the Same as billing address option then Save. This will be automatically applied when you create new customers. However, for the old customer you'll need to manually click the box to enable the feature.
Also, if in case you want to print an invoice with the Shipping address exactly the same as the billing address. Please refer to this article for the detailed steps: Enter the shipping address on all invoices.
Please leave a comment below if you have other questions or you're trying to achieve something else. I'll be glad to assist you. Have a good one.