Click Output
tabPlot
panelPage
Setup. 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.