So it sounds like you aren’t using Advanced PDF. You set this not from the Transaction Printing form but from the actual transaction form. At the top right-hand corner of the Item fulfillment, there is a customize button. Hover over it, and select “Customize form”
There will be a ribbon. Tabs — Field Groups — Screen Fields etc.. You want to grab “Printing Fields” >> “Columns”. Then uncheck the “inventory Details” box.