The salesman didn't mention that the computer had that O/S, and it did not appear on the packaging. The purpose of S mode is supposedly to provide better protection and security. In reality its purpose is to prevent you from using any Apps except ones you buy from Microsoft.
After days of following the Microsoft maze instructions full of dead
ends set up by Microsoft to obstruct or prevent users from getting rid
of S mode, I finally happened upon this set of instructions from
Microsoft and they actually worked! See https://support.microsoft.com/en-us/help/4456067/windows-10-switch-out-of-s-mode
I hope this helps others avoid the endless frustration of trying follow Microsoft's deliberately obscure instructions.
This is an example of a near monopoly exercising unconscionable power over their customers.
