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2026
macOS 26 Stop Extending Blanked My Monitor: Fixing WindowServer IndependentOutput
A single click on Stop Extending in the macOS 26 Screen Mirroring menu left a USB-C monitor black and invisible to System Settings and BetterDisplay. Tracing the WindowServer IndependentOutput flag through kernel, CoreGraphics, and persisted config, then clearing it with a SkyLight private API.