Please go to the Tools-Settings menu and open Security tab. Enable Protect with Password checkbox and enter your password twice. Press OK and close Settings window.
To lock your current Multi Room Audio Player workflow, please go to the Tools menu and click Lock or use Ctrl-Shift-L hot key.
Multi Zone Audio Player will be minimized and locked with password. It will play music as usual, but you need enter password to open main window. Without password you can’t change program settings and control players. Be secure!