Thank you Yutaka for the attempt to recover, unfortunately the refresh does not help.
On the bright side, I now know why this option is there :-).

Now, since me, silly, assigned Shift-S to the swap lines, and I cannot un-do this assignment I am stuck being unable to type capital Ss 🙁

I am at despair, please tell me there is one more trick before the complete removal . 😮