How can I standardize Font Awesome Duotone icons across all pages in Xenforo 2.3?

[Majdev]

How do I make Font Awesome Duotone icons apply to all pages in Xenforo 2.3? Changing icons in the styles/fa folder works, but is there a more correct way to do it?
How can I standardize Font Awesome Duotone icons across all pages in Xenforo 2.3?

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