Per apple standards, the keystroke Command-W should close the topmost active window ONLY. S1 currently makes it close the entire project!!! This breaks the Mac interface. You'd gain more users if you adhered to the excellent Mac interface and not break it! Command-W should close a plugin window, the song window, the console, etc., ANY WINDOW that is currently active. Most effective with plugin windows.
https://support.apple.com/en-us/HT201236
- Command-W: Close the front window. To close all windows of the app, press Option-Command-W.