1. In Word go to the EndNote tab. 
2. Click on the small arrow in the Bibliography section.

        3. This opens an editing box. Select the Layout tab.

In this tab you can change the following:

• font
• size
• bibliography title
• line spacing
• spacing between references

CWYW: Formatting the Bibliography (Windows) (Source: Clarivate Analytics)

CWYW for Macintosh: Formatting the Bibliography in Word 2016 (Source: Clarivate Analytics)