Click the layout tab for which you want
to scale lineweights.
Click Output
tabPlot
panelPage
Setup Manager. At the command prompt,
enter pagesetup.
In the Page Setup Manager, Page Setups
area, select the page setup that you want to modify.
Click Modify.
In the Page Setup dialog box, under Plot
Scale, select Scale Lineweights.
The lineweights in the current layout are scaled
in proportion to the designated plot scale. When you are working
in the Model tab, this option is not available.