Hello,
Since from Elementor version 3.18.0 “Inline Font Icons” feature is enabled by default, the Font Awesome icon font can’t be added to site pages. So I suggest you disable that option in Elementor -> Settings -> Features-> Inline Font Icons: https://prnt.sc/s9JU2TTxfQG- , then navigate to Theme Settings -> Performance -> Fonts & Icons and enable the “Font Awesome library”: https://prnt.sc/uYVDBAxJlNIE , also, make sure that you use icons of 5 version Font Awesome.
Kind Regards