Hi, @ThangCQ . Thanks for joining this thread.
To clarify, what you’ve described is a current limitation to our default address feature.
At this stage, there isn’t an option for a customer to specify an address to be set as their default address by choice. Instead, it’s expected behaviour that the default address of a customer is set to their latest order, regardless if the customer has an account or not.
I understand this isn’t the most ideal way of configuring the default address feature, so I’ll leave this as feedback to our internal development team. Just a note that we can’t guarantee if or when changes will be made, or provide a timeline for updates on this request. However any updates will be listed in our Changelog here.