Windows outside reachable desktop?

Moin, I have my Minecraft Launcher always open outside the reachable desktop.

Whenever I open or close it, you can see the animation as it flies from the area to the left of the desktop to the taskbar.

I have uninstalled MC and reinstalled, but the problem remains.

How do I get the window back to the desktop?

I think you have to turn off the display settings or something (where you see the screens you have) and then the 2nd screen (which does not exist).

Was with me once. Sorry for the weird wording, I'm not at PC.