Styles - Make a Quick Style set the default for all blank documents.

When creating multiple documents with the same style set, it may be easier to set this style set as the default on all blank documents.

1) Click the File>New
2) Select Blank Document & create
3) Once the blank document has opened, change the style set you want to use:

4) The Quick Style Gallery changes to reflect the selected Quick Style set and theme, including Fonts, Colours and Effects.
5) On the home tab, in the Styles group, click Change Styles again and click Set As Default.