In this quick tip for FreeCAD for beginners I demonstrate, how to fix unexpected behavior of the Undo tool. It might be confusing, because the tools sometimes seem to work and sometimes not. The key is to check, whether the model needs re-computation. User can easily see this if the Refresh tool icon is active. After recomputing the model the undo action is recomputed and shown on the display.br br The FreeCAD version used in the tutorial is 0.20.2.