What is New in PTC Mathcad Prime 6.0.0.0 > Custom Margins, Headers and Footer Sizes
  
Custom Margins, Headers and Footer Sizes
Set custom left and right margin sizes and header and footer sizes in your worksheet.
User Interface Location: Click Document > Margins > Custom Margins.
Release: PTC Mathcad Prime 6.0.0.0
Benefits and Description
If you need to use left and right margin sizes or header and footer sizes that are different than the default options provided, you can now set those using the Custom Margins size option. That option allows you to set both left and right margin and header and footer sizes either the same or different values with unit system based on the paper type selected.
For convenience, a new Legacy default margin size has been added to accommodate the margins, header and footer sizes used in legacy Mathcad worksheets. If you used custom margins, header and footer sizes in your legacy worksheet, the converted worksheet will now reflect that custom setting.
All in all, there are now three new margin settings in the Margins menu – Last Custom Setting, the last set custom sizes, Custom, the custom setting of the current worksheet if different from the last set custom sizes, and Legacy, the default margin sizes of the legacy Mathcad worksheet.