Export Image (Quick Export) S’abonner

When I print the label lay-out to a graphic or pdf ("File>Export Image")  the label size changed and is bigger than the original BT label size.

Example BT label size 100x100 mm is after Export to image jpeg, tiff, pdf format 135x135mm

When I use a external PDF printer driver and print to PDF the size will be the same.

I want to use the "File>Export Image" but how I get the same label size.

Using BT 2016 SR3 and Windows 10