How to enable Bundle Size option in Create SMS Operation for Portrait Dialogue

The Bundle size option is now disabled in the Create SMS Operation in Visual Dialogue, it cannot be enabled as it is no longer valid for this operation

Previously it was visible in Operation Properties but this has been removed from portrait dialogue version 5.2

The reason for this is to improve the memory management when creating emails and SMS.

The attached release notes is for version 6.0 SP1, on page 11 this information is mentioned.
UPDATED:  March 28, 2017