Sets ShippedWithReserves=0 in the ReserveManager key. Reclaims the ~7 GB Windows holds back for feature updates. NOTE: future feature updates may fail to install if your free space drops below ~10 GB. Run DISM /Online /Set-ReservedStorageState /State:Disabled after this tweak to fully release the space; this tweak just flips the policy bit.
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-hardware/manufacture/desktop/reserved-storage