I'm not sure where in the settings I changed accidentally but now wherever I type, in browser, note, or emails etc, my s always gets auto corrected to a z. For instance, when I type quantization, the word gets auto-corrected to quantisation. I have to scroll back to change that s back to z each and every time. It's really annoying.
Why does macOS kept auto correcting z to s
high sierrakeyboardmac
Related Solutions
You might want to try just defining ¬ as λ in system prefs/language & text/text/symbol and text substitutions. Normally you need to type a space or another character to get the switch, and there may be some apps it does not work in (Pages and Word have their own symbol and text substitution settings).
Apple has multiple spelling and dictionary pre-installed.
Many application used them.
You will need to turn of spelling in each application you do not want to use it.
Usually it is simple by right clicking on the misspelled word and disable the spelling in that pop up for Safari, Firefox, Chrome ect. Also every application (word processing) has a menu setting to turn off spelling.
I prefer the way of adding my unique words to custom dictionary.
Example for Firefox
In Chrome is bit different it is called LEARN!
Best Answer
Assuming you are on a Mac, go to System Preferences > Keyboard > Text > Spelling: and either select the language you are using or set it to the default, Automatic by Language.
Note that you may also want to check what you have set, or if you changed from the default settings, from the Set Up… pop-up menu item after clicking Automatic by Language pop-up. If you have not modified anything in the Set Up… from the installed defaults you should not hav an issue with using Automatic by Language. This of course is assuming that U.S. English was your original language of choice and not British English which uses s in places where U.S. English uses z in those instances it's being auto-corrected.
On a default U.S. English install, this is what the sheet from the Set Up… pop-up menu item looks like: