...

Note that repeat items automatically generated from a schema may not be dragged outside the repeat control since this would violate the constraints imposed by the schema.

From Schema Schema

You can generate controls automatically from schema elements, but you must first [[V4_Data_Sources_and_Schemas#Uploading_a_Schema |upload your schema]] into your Live Forms application. Once you've uploaded the schema and added schema elements to your form's Data Sources area, you can generate controls from these elements automatically. See [[V4_Data_Sources_and_Schemas#Generating_Controls_from_Schema_Elements | Generating Controls from Schema Elements]]

...