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To change the default paper size for printing, click the Apple menu → click System Preferences → click Printers & Scanners → click the Default Paper Size menu and choose your new size.
Adding a Paper Size to a Printer on Mac
To change the default paper printing size, go to System Settings/Preferences > Printers & Scanners > Default Paper Size and make your changes. To make a custom page size, go to File > Print > Show Details > Paper size > Manage Custom Sizes > + and create the new page size.
Steps
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Click the File menu in any app that can print. You'll need to open the system Print window to set a custom paper size.
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Click Print.
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Click Show Details.
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Click the Paper Size menu.
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Click Manage Custom Sizes.
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Click the + button.
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Type a name for the custom size.
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Type the paper dimensions.
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Type the non-printable area dimensions.
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Click OK.
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Select your new size using the method above. Your new custom size will appear at the bottom of the Default Paper Size menu.