Default list for Newsletter subscribe
When customers subscribe to a newsletter, this will be the default list they are assigned to.
Customer lists are groups of customers that you bring together from your database. These lists can include well-known customers, specific newsletter subscribers, or any other criteria that you choose.
To create a customer list:
Go to Customers in the left menu
Add the title under "Create a new list"
Click Create list
The list will display the date of creation and the amount of contacts registered to that list.