Table of Contents
Project Window
The Project window provides an overview of the project, and allows you to navigate and perform large scale editing.
Edit History Dialog
The Edit History dialog contains a list of all your edits. This allows you to undo any actions in the Project window as well as in the editors.
Branches
You can gather actions in branches. This way you can undo whole branches instead of every single action that you performed.

Branches

You can gather actions in branches. This way you can undo whole branches instead of every single action that you performed.

A branch is created when you have undone at least one action. All following actions you perform are then gathered in a new branch.

To activate branches, activate Use Undo Branches in the Preferences dialog (General page).
To see and edit the branches, select Edit > Edit History.