You can check the spelling in a document or in all open stories. InCopy highlights misspelled or unknown words, repeated words (such as “the the”), uncapitalized words, and uncapitalized sentences. When performing a spell check, InCopy checks all XML content and expanded inline notes.
When you check spelling, InCopy uses the dictionary for the languages you assigned to the text in your document. InCopy uses the Proximity language dictionaries for both spelling and hyphenation. Each dictionary contains hundreds of thousands of words with standard hyphenation breaks.
For stand-alone stories (stories not linked to an InDesign layout), you can customize language dictionaries to ensure that any unique vocabulary you use is recognized and treated correctly. For example, when you run a spelling check (Edit > Spelling > Check Spelling), you can click Add and enter the settings you want.