Changeable the size of the play zone
Mac Version
It's tested on Mac OS 10.15.
SECURITY STEPS REQUIRED BY APPLE
After download, the first time you run the application, it will appear a security alert.
Open the System Preferences "Security & Privacy - General" pane.
If you see an "Open Anyway" button in the Security Preferences, click the "Open Anyway" button.
Then click the "Open" button in that window to launch the application.
Windows Version
It's tested on Windows 10.
It will appear an alert window ("Windows protected your PC").
Click "More Info" and "Run anyway"