While gambling (Fortnite), all windows close at once, but continue in the background?

Hu
2

During the gambling all programs are running but in the background continue I do not know if that is a key combination, whether it is the game (Fortnite) or the operating system (Windows 10 PRO 64bit).

If anyone has idea I would be very happy about an answer.

Je

It's normal that when you start a game other programs will not be stopped. You have to do that yourself.

Hu

While playing, all programs close and I can't open them anymore