If the Create New button is missing or unavailable for a linked-record field or portal table, check these settings:
1. Creating a new record is turned off
The "Allow users to create new records" toggle can be turned on/off for linked record fields or portal tables in the Create & Expand Records section. Check this setting for the specific field or table; creation defaults depend on how the extension was created.
2. The field has reached its linked-record limit.
On a form, a single-record field can create or select its first record while empty. Once a record is linked, remove it before adding another. The miniExtensions setting takes precedence over Airtable’s single-record preference; see how to set a one-record limit. Portal tables do not use Airtable’s single-record preference as a single-record limit.
On the form, the button will be greyed out in two scenarios:
A record is already linked and the field is configured to allow only one record
The maximum number of linked records has been reached
Both of these settings can be controlled in the Advanced section of the linked record field's settings.