Can You Undo Everything RIP Tweaks Changes
Almost entirely, yes, and there are three ways to do it.
Turn an individual tweak off
Every tweak can be switched off from the page you applied it on. This is the precise option when you know which change caused a problem.
Restore a restore point
This returns your Windows settings to how they were at that moment, undoing everything since. It is the reliable option when you are not sure what caused something.
Use the Fixes page
Several repairs restore Windows features that aggressive debloating disabled. Useful when you want to keep your performance tweaks and get one specific feature back.
The one exception
One advanced memory tweak changes protections that Windows enables by default, and it cannot be reverted from within the app. It carries a warning saying so. If you are not certain about it, do not apply it.
Uninstalling does not undo anything
This is the most important thing on this page. Removing the app leaves every change in place, because they are real Windows settings rather than something the app holds. If you want your system back to stock, revert first and uninstall second.
Things outside the app
Programs you installed from the Apps page stay installed. Files removed by Cleanup are gone, and an emptied Recycle Bin cannot be recovered. Those are not settings and a restore point does not bring them back.
If you are stuck
Send us a message from the support bubble at the bottom right. Tell us what you want back and we will tell you the shortest route rather than sending you round in circles.
Related: Undoing tweaks, Uninstalling.