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.
To keep your Dock visible on screen, you need to open the Apple icon > System Preferences > Dock or Dock & Menu Bar and uncheck this option.
Source: https://www.devicemag.com/how-to-keep-mac-toolbar-from-disappearing/