What is Windows S Mode?

Windows S mode is streamlined for security and performance, while providing a familiar Windows experience. To increase security, it allows only apps from the Microsoft Store, and requires Microsoft Edge for safe browsing. In order to install software that did not originate from the Microsoft Store such as third-party programs or other web browsers, you must disable S mode. Some users are hesitant to disable S mode for fear of reduced security. S mode was introduced as a feature of Windows 10 and disabling S mode essentially puts Windows into the default state it has always defaulted to prior to the release of the S mode feature in Windows 10.

How do I disable S mode?
To increase security and performance, Windows 10 in S mode runs only apps from the Microsoft Store. If you want to install an app that isn’t available in the Microsoft Store, you’ll need to permanently switch out of S mode. There’s no charge to switch out of S mode, but you won’t be able to turn it back on. If you’re blocked from switching and your device belongs to an organization, check with your administrator. Your organization can choose to keep all devices in S mode.

1. On your PC running Windows 10 in S mode, open Settings > Update & Security > Activation.
2. Find the Switch to Windows 10 Home or Switch to Windows 10 Pro section, then select the Go to the Store link. Note: Don’t select the link under Upgrade your edition of Windows. That’s a different process that will keep you in S mode.
3. On the page that appears in the Microsoft Store (Switch out of S mode or a similar page), select the Get button. After you confirm this action, you’ll be able to install apps from outside the Microsoft Store.

Source: Microsoft