After typing the Eszet via AltGr+s on a Mac, the Alt+left and Alt+right no longer work.
I forgot the layout with SHIFT and ALT pressed:
Note that the orange keys are 'dead keys' or overstrike characters: é, ñ etc.
Here is the layout of the US International PC keyboard:
No modifying keys pressed:
SHIFT key pressed:
Left ALT key pressed:
Good news: In the latest CafeTran Espresso 2019 with embedded Java, you can use the left ALT key to create ß, º, é etc., without having to restart CafeTran Espresso 2019 because the Alt+left and Alt+right keyboard shortcuts no longer work.