Page Setup... to select 'A4' not 'A4 (small)' and 'Scale: 100%'.
Print... dialogue is displayed make sure
the (Acrobat) 'Shrink to Fit' option is not
not selected.
ClarisDraw doesn't seem compatible with ColorSync on a Mac, e.g. the blues come out much too dark. The above posters were produced using 'color/grey scale' matching to create PostScript and then Acrobat Distiller to create the pdf. Acrobat Reader seems to give a good impression of the printed appearance.