Click the Home tab in the ribbon menu, then click on the arrow icon in the bottom right-hand corner of the Font section. Open any document with your Office Word application. Part 1: Change Default Font in Office Word In this tutorial we’ll show you the easy steps to change default font in Office Word and Excel 2016 / 2019 / 365. In order to make your document or spreadsheet more readable, you may want to change the default font style or adjust the font size. Starting with Office 2007, both Word and Excel use Calibri as the default font.