How to change the design for quotes template?

When the quote is created, from the top menu, click on the “Preview” button:

The preview of the quote will appear in popup screen with three templates in the right (Business 1, Business 2 and Business 3), predefined quote layouts. You can than additionally change which fields you want to be shown in the quote. Furthermore, you can change the default colors of the quote. Click out of the popup screen, the changes will be saved automatically.

The template can be updated after the quote is completed. You can go to edit menu, and click change design, the same popup will be shown.