Diagrams can be created from the Model Explorer view. Creating a diagram can be achieved by right-clicking on one of the shown model classes on the picture . The selected element will own the diagram.
Right-click SysML 1.4 model.
From the context menu, select New Diagram.
Choose your desired diagram type. - Outcome: a file dialog will open, prompting you for a name for the diagram.
Enter a name and click OK. - Outcome: the Diagram Editor will open.
The diagrams will be saved and can be found in the Model Explorer view.