There are different layouts that can be set for each object in Salesforce. The integration within 123 Form Builder allows you to select a layout that exists in Salesforce, then the fields present in that layout will be displayed in the integration for you to associate them.
When you set up the object in the integration, you’ll see the Record types section on the right that allows you to choose your custom record types and will load its fields.
We only show the dropdown menu when your SF account has at least 1 custom page layout created. The dropdown menu will not be available if you only have the default layout (Master).
Finally, associate the Salesforce fields with the form fields and save the changes.