How do I open a new window in the Charts app

I’m on a Mac and after I close the Navigraph window, the chart icon is in my dock, with the gray dot underneath indicating the Chart app is still loaded, but clicking does not open an new window or session. There is no option, either with right click or in the menu bar, to start something new, e.g., CMD-N. I have to quit the app and restart to get a new window.

Not a big deal, but not the behavior I expect.