Same Mac, Big Sur, the Fn key binding is there. This article [1] suggests that it was the case at least in Catalina given the screenshots - but I don't have it

Same Mac, Big Sur, the Fn key binding is there. This article [1] suggests that it was the case at least in Catalina given the screenshots - but I don't have it easily available to test. [1]: https://howchoo.com/mac/mac-remap-fn-to-ctrl https://howchoo.com/mac/mac-remap-fn-to-ctrl