Open Office document writer provides users with option for changing the number of undo. This cam be done using the Options menu.
Click the Tools menu –> select Options from the available menu list. The following Options window will be displayed.
Expand OpenOffice.org tree node and click the node with label as Memory. On the right side under section Undo, there is a field available with label as Number of steps. This can be used for increasing or decreasing the number of undo in Open Office document writer.