The related dock views could be closed on pressing x in the views top right corner. Unfortunally there is no menu option to display them again. It is required to delete the config file umbrellorc to be shown again. Reproducible: Always Steps to Reproduce: 1. start umbrello 2. close tree view 3. restart umbrello Actual Results: tree dock view isn't displayed Expected Results: There should be a menu option to display tree dock view again.