Microsoft is testing a modern Windows 11 volume mixer

Microsoft is testing a new and modern-looking Windows 11 volume mixer accessible via the taskbar Quick Settings panel that helps adjust the volume on a per-app basis and switch between audio devices.

How to manage sound settings on Windows 11

How to enable new volume mixer in Quick Settings on Windows 11 - Pureinfotech

Microsoft: Microsoft is testing a new volume mixer feature for Windows 11 - Times of India

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Windows 11 gets new volume mixer from Quick Settings - Pureinfotech

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OEM deployment of Windows 11 desktop editions

Windows 11 22H2 new features and changes - Pureinfotech