Sets AllowCloudSearch = 0 under Policies\Microsoft\Windows\Windows Search. Stops Windows Search from reaching into your Microsoft-account cloud content (OneDrive, Outlook, etc.) and mixing it into local results. Keeps search local, faster, and offline. Reversible.
MaxTweaks applies this tweak with one click and snapshots your original setting first, so you can revert it cleanly at any time. A System Restore point is offered before batch changes, and every tweak links to its official source.
Get MaxTweaksOfficial documentation: https://learn.microsoft.com/en-us/windows/client-management/mdm/policy-csp-search