Question:

Why are all objects enabled in a Target Subscription with Include Source Data View enabled?

Answer:

Currently, the Source Data View File cannot be split apart and must be provided in full. To export the Source Data View File with the target subscription, export all objects. Specify select fields to export for each object but the Do Not Export option cannot be selected as the option is faded out. It appears as shown below for all fields: 

Related Documentation:

N/A

Thank you