S mode allows only apps from Microsoft Store to be installed, and requires Microsoft Edge for safe browsing. Disabling S mode will allow you to install 3rd party applications such as Electric Quilt on your computer. Disabling S mode does not make your computer insecure, as long as you the user do not download and install unknown and unsigned applications from the internet.

Here are the directions from Microsoft on how to switch out of S mode, as well as some frequently asked questions about S mode.
Please note: Computers cannot be switched back into S mode.

If you get the message, “Get apps from Store.”
Here is how to resolve that…

  1. Click Start > Click Settings
  2. In the Settings window, click Apps
  3. In Apps & Features, change Choose where to get apps from The Microsoft Store only (recommended) to Anywhere.
  4. Close the Settings window.
    The change will only take effect when you close the window.