1 Select a new font and size in the Font dialog box, and then click Default. 2  Word will ask you if you want these changes to apply to all new documents using the Normal template (normal.dot). 3  Click Yes to make the changes permanent. 4  The change will apply to Word's Normal/default style and to all styles based on Normal.his document details how to change the default font, font size, and page margins in Word. 1  Word 2003 and Word XP. 2  Open a new document, click on the Home tab, click on the Font dialog box button as shown in the screenshot below, and select the Font tab.