Usually Smart App Control cannot be enabled without re-installing Windows it would be very unusual for Windows to enable that automatically, however, Microsoft have announced they are enabling an option in a future update that will allow Smart App Control to be enabled and disabled without re-installing Windows.
1
If that function was not previously enabled and has somehow been enabled on your PC, is that causing any problems with apps installed on your PC?
2
Click your Start Button, then just type winver and press Enter, please provide a screenshot of the resulting dialog box.