ClickFile
menu Page
Setup Manager.At the Command prompt, enter
pagesetup.
In Page Setup Manager, Page Setups area, the layout for which
you want to set the paper size should be selected. If not, select
the layout. Click Modify.
In the Page Setup dialog box, under Paper Size, select a paper
size from the list. Click OK.
The paper sizes
that are listed depend on the plotter specified in the page
setup.