S mode is often pre-installed on entry-level laptops, student devices, and hardware for seniors. Microsoft Supporthttps://support.microsoft.com Switching out of S mode in Windows - Microsoft Support
Essentially, it turns your PC into a "walled garden," similar to a smartphone or a tablet, where every app you run has been pre-verified by Microsoft. what is windows s mode
You can only install and run apps downloaded from the Microsoft Store. Third-party installers (.exe or .msi files) downloaded from the web will not run. S mode is often pre-installed on entry-level laptops,