I am a complete novice with UML and, in particular, the UML tools. So I'm sorry, should my question be stupid.
I am currently playing with the UML2 editor. Adding a few classes, creating associations, stuff like that. I remember once having added a package and suddenly having that package as the diagrams top. (Meaning that the package was visible at the left hand top of the diagram and I was editing the packages contents.) Is that possible? By using what actions? And, how can I return to the upper level?