Silly question - Microsoft word 365

Is this any use?
https://www.google.com/search?q=change+default+language+in+word&rlz=1C1CHBF_en-GBGB924GB924&oq=change+default+langu&gs_lcrp=EgZjaHJvbWUqBwgAEAAYgAQyBwgAEAAYgAQyBwgBEAAYgAQyBwgCEAAYgAQyBggDEEUYOTIHCAQQABiABDIHCAUQABiABDIHCAYQABiABDIHCAcQABiABDIHCAgQABiABDIHCAkQABiABKgCALACAA&sourceid=chrome&ie=UTF-8

Unfortunately not. I have already set the language to English U.K. I have also added English U.K. to the dictionary but it still insists on using English U.S. by default. It’s a bit of an annoyance because I see a bunch of red lines thinking I’ve made spelling errors but it's silly things like how sulfur is typically british but sulphur is American.

Unfortunately not. I have already set the language to English U.K. I have also added English U.K. to the dictionary but it still insists on using English U.S. by default. It’s a bit of an annoyance because I see a bunch of red lines thinking I’ve made spelling errors but it's silly things like how sulfur is typically british but sulphur is American.

Sulphur is British and Sulfur American, so Word might actually be correct..?

Are you loading Word documents that have the language set? Or Word documents that have been created by online Word 365? BTW - when you have figured this one out could you also let me know why Word at work opens all previously opened documents that were not shut down properly? :-)