Disable Copilot

To Disable Copilot, add the following registry key:

HKCU\Software\Policies\Microsoft\Windows\WindowsCopilot\TurnOffWindowsCopilot
Type: REG_DWORD
Value: 1

It can be done through a command prompt/powershell running as administrator by running this line:

reg add HKCU\Software\Policies\Microsoft\Windows\WindowsCopilot /v TurnOffWindowsCopilot /t REG_DWORD /d 1 /f 

Restart your PC to have it take effect.

Note: This does not affect the copilot built into Microsoft 365 apps, just the native Windows Copilot.

To reenable Copilot, delete the above registry key or set it to 0.

The key can be deleted through a command prompt/powershell running as administrator by running this line:

reg delete HKCU\Software\Policies\Microsoft\Windows\WindowsCopilot /f

Reference

https://answers.microsoft.com/en-us/windows/forum/all/how-to-uninstall-copilot-i-dont-want-to-disable-it/b301b77d-b879-4433-9979-f8795805e9f1answers.microsoft.com