Just downloaded it and installed it in virtualbox. First thing I clicked on was Photos, for no particular reason. So, I'm in Photos and there is nothing there

Just downloaded it and installed it in virtualbox. First thing I clicked on was Photos, for no particular reason. So, I'm in Photos and there is nothing there for me to do (obviously). I want to go back to the main screen (where I came from) but there is nothing I can do. I'm suck in Photo land. The is nothing to click on that will take me back. ESC doesn't do anything, or any other key for that matter. Right click brings up a Feedback form. How the hell are you supposed to navigate this thing? EDIT: Hovering at the top of the screen changes your mouse cursor into a hand. I can drag the entire screen which makes it small. I guess the purpose of this is to dock the current application or something. I still can't go back to the main screen however...