When I press the 'Mission control'-button(?) / F3, It shows me 6 extra blank windows. They're called 'QuickLookUISevice'. When I press on them nothing really happens.
Been searching for a solution, but unfortunately not able to find the right. Perhaps anyone on here knows more about this issue and is willing to tell me a little more about it. I'm quite curious how this occurs and how to fix it.
I'm running HighSierra 10.13 on a MacBook Pro