Multilingual User Interface (MUI) is used either in a Windows 11/10/8/7 deployment scenario or on a local computer when the user changes language support.

Microsoft says the bug affects Windows 10 client versions 21H2, 21H1, 20H2, and Windows Server 20H2. Windows 11 users and customers using only one input language, are not affected.

An Input Method Editor helps users to type in different languages & enter the special characters/symbols. See how to install & user IMEs on your Windows 11/10.

Microsoft releases smart Phonetic keyboards for 10 Indian languages in its May 2019 update (19H1) for Windows 10.

Microsoft has addressed a known issue triggered by recent Windows 10 updates that caused the Input Indicator and Language Bar not to appear in the notification area.