To expand the page edges so your graph fits on the page, click File | Page Setup. In the Page Setup dialog, click the Paper Size drop-down menu to choose a new paper size. If the desired page size is not listed, choose Custom to enter a new size.
Grapher 13 and earlier versions did not support custom page sizes. Instead, available page sizes were determined by the printer driver. If your desired page size is not available in your Paper Size drop-down menu, printing to a PDF print driver will offer more page size options.
Updated February 2023
Page Setup doesn't allow changing of page edge - only page margins.
Grapher does not currently support setting a custom page size. I have added your vote for this functionality to our suggestion file. In the meantime, I find that changing the printer to a PDF print driver tends to provide more page size options. To change the printer that Grapher is pulling available page sizes from, click the Printer button in the Page Setup dialog, select the desired printer, and click OK.
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