WOH HUI DOH
KRundo stack is not working. undo stack is not working. Before I paid for it, I did not know that the undo stack is not working while using the reading mode(which is showing the cross). During the use of the mode, the cells vertical and perpendicular are highlighted. When I modify some cells by mistake, I wanted to use "Ctrl + z"(undo). But it is not working. So, for the moment, I just use Excel without DOSE.