When you create or open a diagram in System Architect, a tab is created for the diagram in the application workspace. If you have more than one diagram open, you can simply click the diagram’s tab to bring it to the foreground for you to work on. When you have a certain number of diagrams open, and there is not enough room to display all of the tabs, System Architect adds left and right arrows for you to navigate through the tabs. You can also click the drop-down arrow to get a list of all currently open diagrams, and select the diagram you want to work on. Clicking the ‘X’ at the far right closes the diagram currently in the foreground; you are prompted to save your diagram before it is closed, if you have not saved it since you made changes.