Update 3 6 action history

3-6-action-history.md

 # Undo & redo (and how to use Actions Pane)
 
+![](img/3--6-actions-pane.png)
+
+The **Actions Pane** displays the history of actions related to the current selected layer.
+If the selected layer is a default layer (background map layer, borderline layer), the **Actions Pane** shows the whole edit history of the **Rendering Pane**. For other types of grid layers, it only shows the edit history of the selected layer.
+
+You can select an action item in the action list and 
+
+*  Click the *Undo* button or click the *Up* icon to undo the history entry to the former action item. 
+*  Click the *Redo* button or click the *Down* icon to redo the history entry to the later action item. 
 
 <br><br>