Windows 11 live captions does not support Arabic for speech recognition. The supported live captions speech recognition languages listed for Windows 11 are Chinese (Simplified, Traditional Hong Kong SAR, Traditional Taiwan), Danish, several English locales, French (Canada, France), German (Germany), Italian (Italy), Japanese, Korean, Portuguese (Brazil, Portugal), and Spanish (Mexico, Spain).
Arabic is supported only for translation into English on Copilot+ PCs in live captions, not as a speech recognition language for live captions in Windows 11.
If the goal is to help improve Arabic support, feedback can be submitted through Feedback Hub by pressing Windows key + F while live captions is active, then selecting Accessibility > Live captions.