Windows 10 and Windows 11 in S mode FAQ - support.microsoft.com
https://support.microsoft.com/en-us/windows/windows-10-and-windows-11-in-s-mode-faq-851057d6-1ee9-b9e5-c30b-93baebeebc85
To increase security and performance, Windows 11 in S mode runs only apps from Microsoft Store. If you want to install an app that isn't available in Microsoft Store, or if you have Windows 10 Pro, Enterprise, or Education and want to upgrade to Windows 11, you'll need to permanently switch out of S mode.
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