I thinkg it’s a bit to correct in code, IMHO.
Export File Names window as a preview takes a layout that is selected in Write mode. So if you change layout for printing and want to see filename preview for selected layout, you need to go to Write mode, select that layout and then go back for print preview.
Also requested this before by others, but still not corrected.
Cannot get the Layout token to work in Print/Filename Options - Dorico - Steinberg Forums