You can check the spelling in the Description, Memo, Notes, and Message
fields of the following forms: invoices, estimates, sales receipts, credit
memos, and purchase orders. As a rule, whenever you see the Spelling button in
a form or window, you can spell check most of the fields in which you enter
Note: The Spell Checker does not have the broad functionality of
other spell checkers you may have used. It is intended to help you quickly
check the spelling of words in most fields in which text can be entered.
You can run Spell Checker automatically by turning it on in Preferences.
If you've turned off the Spell Checker preference, you can check the
spelling on a sales form by clicking Spelling in the form's toolbar.
Turning off the Spell Checker