Sets ShowSyncProviderNotifications = 0 under Explorer\Advanced. Stops the banner ads Explorer shows promoting OneDrive and Microsoft 365 ('Back up your folders', 'Get more storage') disguised as sync notifications. Cleaner Explorer, no upsells. Takes effect on the next Explorer refresh. 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/win32/shell/