I use an old version of MS office at work, the button is at the top left. I'm guessing you're referring to a current year version.
I have a win11 laptop that I use for games that won't run on win7, the modern OS is infuriating.
Yes, it's the one with the ribbon that changes when you click things that used to be in the drop-down menu.
I despise Win11 and pretty much everyone here despises it at well. Infuriating is a good word, the interface just makes me angry for some reason.