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Before you begin. Make sure to check Use Bootstrap icons for Bootstrap and select Font Awesome for the Icon set to use Font Awesome icons under the Appearance section of for your college theme.
When inserting icons, you should hard code the icons by switching to Source mode in the CKEditor5 toolbar.
Once you are in Source mode. You can now hard code any Bootstrap Icon and Font Awesome Icon by wrapping them with an <p> tag and <em> tag. See below for an example.