Edu-X-Pro theme had following font icons library integrated in the theme. You can enable / disable them from theme settings page.
Font Icons Libary Added in Theme
You can see the list of font icons library added in the theme from the theme settings page. Here you can enable / disable these font icons library.
How To Use FontAwesome 4
https://fontawesome.com/v4.7/icons/
How To Use FontAwesome 5
https://www.drupar.com/node/1549/