Yep and he switches some around. Realize realise. I'm American but grew up with the OED at home so I often make mistakes and use -ise or colour. Used to be an issue in school for me because I'd get hit for spelling errors 🤣🤣🤣
Maybe my assumption is biased because of my own experience.
👍 

 Completely understand losing marks due to spelling was the reason I remember the default is American English 🤣. Especially important after a XP nuclear reset which seemed fairly common compared to todays operating systems.