Proofing language remains stubbornly German

I have a PC bought in Germany with win11 Home in German (Os build 22631.5909). I changed win11 language to english, The language region options to english. Regional format to english. Keyboard to english. Uninstalled German from preferred languages and left only US english. It displays in english, but when I have to type something in an editor window, such as in a forum or a blog, the proofing language remains stubbornly German. Any idea why?
PS: Sorry for my typing errors.... proofing doesn't work in this win11 community editor either.