Points all active adapters at Quad9's 9.9.9.9 / 149.112.112.112 resolvers. Quad9 is a Swiss non-profit that blocks malicious domains using threat intelligence and does not log personal data. One-shot: undo with 'Reset DNS to automatic'.
MaxTweaks applies this tweak with one click and clearly marks it as a one-shot action so you always know what can and can’t be undone. A System Restore point is offered before batch changes, and every tweak links to its official source.
Get MaxTweaksOfficial documentation: https://www.quad9.net/