best way to close a conn project?

Dear Alfonso

Sorry, I have a somewhat silly question... When I work on a conn project using the GUI, and want to upload or start a different project, what's the right way to do it so that my project will not be run over or loose data? Just click the "load"  or "new" buttons?  There's no "exit" or "close" button that I could find in order to first close a file before uploading another one. 

Thanks!!

L.