I updated to 1.3.0, and the tree disappeared. Then I quit the app, and relaunched it, which did nothing. Turns out I could move the tree using the Window menu --> Move and resize, after which the tree became HUGE and filled up a third of my display. When I clicked it, it became small again, as it were before the update. So there's something to fix I think.
Also, the settings panel is impossible to read when you are in dark mode, unless you click the options. And for some reason, the settings sometimes stay in a grey color after having been changed.