Never seen this Window

Interesting, @r1ma. That's the console window, so it's basically just an output of the logs that are being generated, but I'd not expect that shortcut to open it up. Perhaps a slip of the fingers there? The "show console" shortcut is Ctrl + `` which isn't near close enough to` for that to be a good explanation on my U.S. keyboard, but perhaps easier to access with your fingers being a bit off on other keyboard layouts? It's nothing troublesome – just there if you need to see logs in real time for any reason – but it definitely shouldn't be popping up without prompting.