If it has nxdm_ in front, then it is used for managed mode, otherwise it's for native. Ugs_sheet_templates or nxdm_ugs_sheet_templates.pax is for the sheet templates (Insert -> Sheet). Ugs_drawing_templates.pax or nxdm_ugs_drawing_templates.pax is for the drawing templates (File -> New). Ugs_model_templates.pax or nxdm_ugs_model_templates.pax is for the model templates (File -> New). There are three (native or managed is irrelevant). Then this is what i think the solution to your problem is: If you choose drafting, do you see a choice menu like in the uploaded pics, If not please try to change the customer defaults like in the second picture of uploaded pics. Just have a look, i think you might have edited the drawing or model templates, what you looking for is a sheet template to avoid a second.