How to disable autocorrect for Message in macOS
Message for macOS automatically check and correct spelling mistakes while you're typing. It is a handy feature, but it's more of a nuisance for someone like me who doesn't always type in perfect English on purpose. Even more so is for those who communicate via other English or Roman alphabet-based languages.
Autocorrect for Message in macOS can be disabled from Finder's configuration menu.
Steps to disable autocorrect for Message in macOS:
Click on Edit at the Message menu.
Click on Spelling and Grammar option.
Click on Correct Spelling Automatically to remove the tick mark.