Synonyms that are in the dictionary are marked in green. Synonyms that are not in the dictionary are marked in red.
Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
This will allow you to use the function keys without having to hold down the Fn key.
Source: https://www.devicemag.com/how-to-use-macbook-pro-keyboard/