I am far from an expert and learning here… now that I look at that prior topic with fresh eyes it seems that Search got moved to control F, which makes sense. It had apparently been interfering with people entering the diacritics.
Evidently those writing in Polish use the right Alt key to make the diacritic versions of certain letters.
In our instance ALT + s does not make the ś, nor other letters. But as we see I can copy-paste it in!
Is there a way to enable or enter these kinds of letters? Google tells us this:
How do you type Polish A? Using Right-Alt to type a Polish character is simple. Press the right Alt and keep it down and then press a Polish character that is the “base”, then release both. For example to type ć, press Right-Alt & c, to type ś, press Right-Alt & s etc. For Ń, press Right-Alt & Shift & n.