How to navigate Cubasis

Lars, I checked out the link you sent me thank you. I’ve also looked through the help file in the app. I still can’t figure out how to close one project and open another. I can import MIDI files, and load them, but when I want to go to another, I can’t close the one I was just working on. If I simply open a second file, it just loads at the bottom of the one already open. How can I close the first and open the second?

Thanks again for your help.