To switch on this feature, you need to set the system parameter "enableWorkflowFileFormatSelection" to true.

It will allow the MFD user to switch output file type settings like other available scan settings (color, resolution, etc.) on Embedded Terminal for Konica Minolta (native). 

For the OCR processing step, which defines the output file format by itself, and for delivery overwrite behavior append to PDF and prepend to PDF, this possibility is still disabled because processing logic depends on the file format.