A family of Microsoft word processing software products for creating web, email, and print documents.
Dear WXuemei
Good day! Thank you for posting to Microsoft Community. We are happy to help you
I apologize for the inconvenience. It seems that the East Asian Languages preference does not appear in Office for Mac when macOS language preference is not set to English (US). Kindly read this thread for more info: East Asian Languages preference not appearing in Microsoft Office 2019 - Microsoft Community
To use the phonetic guide in word: From the menu bar, Click Word > Preferences... > Choose East Asian Languages > Set the language on which phonetic guide you want > Restart Word > Highlight the text you want > Click Phonetic Guide icon.
We look forward to your reply. Thanks for your cooperation.
Sincerely,
Tin | Microsoft Community Moderator