If you start a timer in Focus mode, then close close the timer window accidentally with the Command + W command, there is no obvious way to get the timer back. If you close the main window then click the icon in the dock that reopens the main window but without the timer. If you click the New Window menu item then you get the timer back, but its not clear thats the method at all. The timer window's visibility should be tied to the main window and ideally it should not be allowed to close with the Command + W command.