To get back to the start window, File / Open Another Session (it’s not quite the same, as new sessions then end up in a new window). I was confused for a while too. I wanted to be able to do that because I often modify or create new connections, and you can’t do that from the ‘connect to another target’ button. Interestingly, now I go to try this today, I can’t actually open another session from that window. it starts the handshake, tells me the server’s key has changed (it has), then it closes.