In Settings> Personalization > Taskbar, you can turn off Copilot. However, if that's not enough and you wan to disable it completely, you will need to do this in registry. To do so, launch Registry Editor, then go to. HKCU\Software\Policies\Microsoft\Windows. On the left, right click on the Windows folder, go to New > Key, name it "WindowsCopilot". More @Wikipedia
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