Unit of Measure

Hi,

i am trying to set a primary unit of measure for products. when i configure
MAIN_WEIGHT_DEFAULT_UNIT ► Default unit for weight (0=kg, -3=g, …)
to home - setup - other setup
i dont get the a field added to the products configuration page.
I was able to configure this on version 17.03 but not with version 18.0.2.

Kindly advise.