Select a new font and size in the Font dialog box, and then click Default.Open a new document, click on the Home tab, click on the Font Dialog Box Launcher (as shown in the screenshot below) and select the Font tab.Click Yes to apply the new margins to all new documents.Set the new margins that you would like to make the default and click Set As Default.To change Word's default page margins, click on the Page Layout tab and click on the Page Setup dialog box button as shown in the screenshot below.

Select All documents based on the Normal.dotm template? and click OK to update the default for all new documents.

Choose the font settings that you would like to make the default and click Set As Default.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.Confirm the changes by selecting Yes when prompted to set as the default for all documents of this type.To modify the default margins, select the expand button underneath Layout > Page Setup and change the settings as desired.For more advanced settings, such as character spacing, select Advanced and follow the same procedure to Set As Default.Confirm the changes for all documents of this type by selecting All documents based on the Normal template and then selecting Yes.Modify the font settings as desired, then select Set As Default as shown below.Select the expand icon underneath Home > Font as shown below.In most cases, this will be Blank document. Open a new document of the template you would like to update the default settings for.

This document details how to change the default font, font size, and page margins in Word.

Font dialog box launcher word