Clicking import settings when creating a world will cause the game to be stuck on the Mojang logo and the game cannot be closed from the computer/and if you open the file, when in fullscreen.

So I was clicking import settings when I was creating a new world
Then it shows the Mojang loading logo and the files for it.
But when I click open or cancel it will just minimize the game.
And if I exit the game it will maximize the game. This has been going on for days. And I cant exit full screen.