History Panel

Panel is a window displaying all available undo and redo steps in active document and all the saved versions.

Areas

1 Versions list - versions contain saved states with a thumbnail of page or spread.

Double click  opens the version state, Alt+double click  opens the version in a new document. 

The process of undoing beyond current session version will always result in opening the version in a new document.

2 List of actions you can undo. To undo click on the desired row.

3 Indicator of current state

4 List of actions you can redo. To redo click on the desired row.

Controls

5 Create a new document containing current document in selected state.

6 Save version.

7 Delete this and all further steps / delete version. Depends on which item is selected.

Be careful - there is no way to undo the deleting

8 Small rows in the Versions list

9 Medium rows in the Versions list

10 Big rows in the Versions list

11 This button opens History menu

To show History panel in the workspace go to Window menu in Adobe InDesign and choose History.