How to keep the figure scale with different screen resolutions when using print to PDF?

Hello Matlab Pros,

I use this code to create a figure with a rectangle and print it to pdf:

      f1 = figure(...
          'Units',            'centimeters',...
          'Position',         [1 1 21 29.7],...
          'menubar',          'none',...
          'name',             'Report',...
          'numbertitle',      'off',...
          'Color',            'w',...
          'resize',           'off',...
          'Visible',          Visability,...
          'PaperType',        'a4',...
          'PaperOrientation', 'portrait');

      axes('Position',        [0 0 1 1],...
          'Visible',          'off',...
          'XLim',             [0 21],...
          'YLim',             [0 29.7]);

      rectangle('Position',[2.85 2.7 16.45 24.7])

      print('Test','-dpdf')

The problem is, that if the resolution of my screen changes, the PDF changes drastically. Is it possible to prevent this? On the attached pictures you can see exactly what I mean (The first one is with a resolution of 1920x1080 and the second one with 800x600).

Thanks in advance!

Best Regards Michael

EDIT: It should be mentioned that the layout of the first picture is the one I actually want to have, regardless of the screen resolution.