History: Undo and redo#
Use this page when you want to undo or redo document operations, inspect the action history, or understand why some operations cannot be reversed.
Each document in SAMSON has its own history - a list of undoable actions done with the document.
You can open the History view using Interface > History or via the Ctrl+3 shortcut on Windows and Linux or Cmd+3 on Mac.

What this page covers#
This page explains how to open the History view, move through previous document states, and use undo and redo while editing, building, or moving structures.
You can go through the history - through the states of the document - by clicking on actions in the History view or by clicking in the Edit menu on:
- Undo (, : Ctrl+Z, : Cmd+Z),
- Redo (, : Ctrl+Y, : Cmd+Y).
Note
Not all the operations are undoable, if in between of undoable operations you did operations which are not undoable it might not be possible for SAMSON to properly undo operations, which may result in a loss of data.

Related pages#
- Work with structures: return to the structure-work hub.
- Moving objects: use history while trying transformations.
- Building molecules: use undo and redo while constructing or editing structures.