Help with LBF forms and ICD-10 Dx codes

Quick question regarding LBF forms and including ICD-10 codes on a Lab Requisition I created. See attached PDF.
Lab_LBF_entries.pdf (103.1 KB)

I am able to select ICD-10 diagnoses which are listed as the ICD-10 numeric codes when entered into the LBF. However, once printed, they are replaced with the descriptors. See next PDF
Printed_form.pdf (80.3 KB)

I find this strange since there is an option to convert ICD-10 codes into the descriptors as an option, so why have it do it automatically?
See next PDF
LBF Layout Lab Form.pdf (148.9 KB)

The above PDF shows that “Billing Code Descriptions” is in the “Options” field, however in the absence of that option, the printed copy STILL prints the descriptor.

So… My request is how to change the default behavior of the “Billing codes” Data Type to keep the ICD-10 numerical codes? And, as a follow up, what is the purpose of the “Billing Code Descriptions” option.

Thanks in Advance!