My experience on Windows is that it selects your Onedrive account automatically. I've had to change the default because it kept trying to upload my documents.
I've also had several scratch documents appear in a cloud drive at some point, probably through autosaves. Disabling cloud integrations tends to generate nag screens or "helpful" warning toolbars to "restore functionality". Going offline in Office on Windows is a path riddled with deceptive design. This is the education version of Office on Windows 11, though I haven't used or updated it in a while; not that I think Microsoft's data collection team has suddenly had a change of heart.
Non-enterprise versions of the product don't seem to be available without signing in to a Microsoft account at all. You can log yourself out out after activation, but realistically very few people know about that and even then you've already given Windows a hint of a Microsoft account, which it will use to try to sign you into every chance it gets.
I've also had several scratch documents appear in a cloud drive at some point, probably through autosaves. Disabling cloud integrations tends to generate nag screens or "helpful" warning toolbars to "restore functionality". Going offline in Office on Windows is a path riddled with deceptive design. This is the education version of Office on Windows 11, though I haven't used or updated it in a while; not that I think Microsoft's data collection team has suddenly had a change of heart.
Non-enterprise versions of the product don't seem to be available without signing in to a Microsoft account at all. You can log yourself out out after activation, but realistically very few people know about that and even then you've already given Windows a hint of a Microsoft account, which it will use to try to sign you into every chance it gets.