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Microsoft in their infinite wisdom has replaced the Hide Desktop icon with Copilot.
(programming.dev)
This is a most excellent place for technology news and articles.
I think it's currently in A/B testing as it's not like this on either of my Windows machines that installed updates this week. I don't think they let you disable the things you're in A/B testing for.
Either that, or it's not GDPR compliant, and they're not rolling it out to the UK or EU.