After you create the look you want with color, fonts, and effects, you can save your settings as a new theme that you can apply to other documents you create. The new custom theme will then be available at the top of the Themes gallery so that you can find and apply it easily.
After you’ve made all the changes in Document Formatting you want to make, click Themes.
Click Save Current Theme.
The Save Current Theme dialog box opens.
Type a name for the theme.
When you save your theme, Word ...