I am having a minor issue with Unity Hub: After clicking on a project it loads Unity Editor which is fine. Now if I switch back to the Unity Hub app, there is no window. It is closed and there is no option in the menu to reopen it. The only way to get back the window is instead of switching to the app you need to re-launch it -- even if it was already running, magically the window comes back... Same thing happens if I press ESC key on Unity Hub... I am on MacOS Mojave, if that makes any difference.