Open the Payment Plan page from the left menu (older versions of the site called it the Debt Snowball Table) and click Download Excel Spreadsheet, in the row of controls above your plan next to Monthly Budget. Your browser downloads the file straight away.
What is in the file
The spreadsheet holds your whole payoff plan, one row per month: the payment to each debt, the snowball amount, any additional payments, the interest paid so far, the balance left and the month's total. It follows the start month selected on the page, so it matches the plan on your screen.
The file is a standard .xlsx, so it opens in Excel, Google Sheets, Apple Numbers and most other spreadsheet programs. The export is free on every account.
Printing it
For a paper copy, open the file and print it from your spreadsheet program, where you can choose landscape and fit the columns to the page width. For the other ways to get a plan on paper, see How do I print my debt payoff plan?