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Hi,
LDSI requires to use custom components to display icons, we do not support that. We support CSS/SCSS way to manage icons.
I've opened a FR for that https://github.com/bryntum/support/issues/9563 , but we will wait more requests for that because it might be priotitized and started, I am afraid. You are the first for years who need it. If you need it fast, you can request Sponsored Feature service using the button "Contact Us" on this page https://bryntum.com/services/
All the best,
Alex Lazarev
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SLDS uses SVG shapes for icons and the way they are applied is very different from FontAwesome, so there is no easy way to directly swap them. However, you can create your own icon font and use custom glyphs for the icons you wish to replace.