Function bevy_window::exit_on_all_closed

pub fn exit_on_all_closed(
    app_exit_events: EventWriter<'_, AppExit>,
    windows: Query<'_, '_, &Window>
)

Exit the application when there are no open windows.

This system is added by the WindowPlugin in the default configuration. To disable this behavior, set close_when_requested (on the WindowPlugin) to false. Ensure that you read the caveats documented on that field if doing so.