For Michel: If anyone can tell me how to disable it just for my app under Catalina, I would appreciate it. You can try: defaults write NSAppSleepDisabled -bool YES where your domain is defined in your plist as CFBundleIdentifier. Then try defaults read and you should see NSAppSleepDisable=1; This does not always work if you Hide your app. John

For Michel, My answer was truncated by the system. You should try defaults write your_domain NSAppSleepDisable -bool YES the system erased your_domain in my initial answer John