Tool window quick access doesn't work in IntelliJ IDEA Sometimes

Hi, I'm Using IntelliJ IDEA 2018.3.5 (Ultimate Edition)

I've been going through all the documents from JetBrains, but I couldn't find how to show my tool windows. Sometimes IDEA behaves unexpectedly by not giving me a way to show my tool windows. I've tried to access them using my usual keyboard shortcuts, Find action feature or by clicking this icon in the status bar:

But unfortunately, IDEA does not give me any response back.

By the way, It works If I completely shutdown IDEA, but I can't do that when I am in the middle of a keynote since it takes time to reboot.

Please, how can I fix the issue?