Restoring managed tweaks is included in every plan, even after your subscription expires. For a single change, open Optimizations and use Revert on the applied item; in Games, open the profile and choose Revert profile. To undo every optimization at once, use Backup > Revert all. The activity history records actions, but it doesn’t work as a restore picker.
How to revert a change
Undo one tweak, a game profile or every optimization you applied.