Read Dotdigital list IDs from a customer attribute, instead of (or in addition to) the list settings.
Yes – list IDs are read from the customer attribute set in List Attribute Field. The value can hold one or more list IDs, separated by commas.
No – only Default Contact List and Map Country to Contact List are used.
Good to know
When this is Yes, choose what happens when the attribute has no list ID in List Attribute Fallback.