@Smitty Smith Page margins aren't included. My OP was a direct quote from Microsoft Help in Excel, where they say that page margins can't be changed as a default setting. Up until 2016 or so, that was not the case.
Settings that you can save in a workbook or worksheet template
Cell and sheet formats.
Page formats and print area settings for each sheet.
The number and type of sheets in a workbook.
Protected and hidden areas of the workbook. You can hide sheets, rows, and columns and prevent changes to worksheet cells.
Text you want to repeat, such as page headers and row and column labels.
Data, graphics, formulas, charts, and other information.
Data validation settings.
Macros, hyperlinks, and ActiveX controls on forms.
Workbook calculation options and window view options.
@listondavis Thanks for the heads up. I suppose an alternative would be to record a macro applying your page setup settings, then add that to your Personal.xlsb workbook. That way it will be available to any open workbook.