In the Pane on the left of Xcode I have the list of my Groups & Files with the currently open project. How do I add another project to this list? Currently when I go to File -> Open Project and choose a different project it is opened in a new window (or whatever windows are called on macs ) I can split it vertically by clicking the little square box but that just shows me the same project, below. Also, how do I stop things opening in a new window when I double click them? I have "open counterparts in same editor" checked.