Sets Enabled = 0 under HKCU\Software\Microsoft\Input\TIPC (Text Input Personalization Collection). Stops Windows from collecting samples of what you type and ink to build a personal language model that's synced and used for telemetry. Disabling it stops that local harvesting; autocorrect/suggestions still work from the built-in dictionary. 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/privacy/manage-connections-from-windows-operating-system-components-to-microsoft-services