Undo changes

You can undo only those actions that alter the project data. For example, you can undo a change to a property value, but you cannot undo the scrolling of a panel or the activation of a tool.

You can sequentially undo as many as 99 of the most recent changes made to the project, depending on the Levels Of Undo setting (Edit > Preferences > General (Windows) or After Effects > Preferences > General (Mac OS)). The default is 32.

To avoid wasting time undoing accidental modifications, lock a layer when you want to see it but do not want to modify it.

To undo the most recent change, choose Edit > Undo [action].
To undo a change and all changes after it, choose Edit > History, and select the first change that you want to undo.
To revert to the last saved version of the project, choose File > Revert. All changes made and footage items imported since you last saved are lost. You cannot undo this action.