Choose Page Layout → Page Setup → Size. At the bottom of the Size menu, click More Paper Sizes. The Page Setup dialog box appears, with the Paper tab showing (Figure 4-2). Why the Paper tab? Because you opened the box using the More Paper Sizes button.
In the Width and Height boxes, enter the size of your custom paper.
The quickest way to change the Width and Height settings is to select the numbers in the boxes and type your new page dimensions. Your new numbers replace the previous settings. You can also click the up and down arrows to the right of the text boxes, but it’s slow going as the sizes change in tenths of an inch. Notice that as you change the dimensions, the Preview image at the bottom of the Page Setup box changes to match
Click OK at the bottom, to close the dialog box and make the changes.
The Page Setup box closes, and your custom-sized document shows in Word.
Using the Paper tab of the Page Setup box, you can choose from standard paper sizes or set your own custom paper size. Dialog boxes are great for making several changes at once. On this tab you can also choose a paper source (if you’re lucky enough to have a printer with more than one paper tray).
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Using the Paper tab of the Page Setup box, you can choose from standard paper sizes or set your own custom paper size. Dialog boxes are great for making several changes at once. On this tab you can also choose a paper source (if you’re lucky enough to have a printer with more than one paper tray).
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https://www.oreilly.com/library/view/word-2007-for/0596528302/ch04.html
Explanation:
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