@jetbrains has a really bad habit of not documenting their APIs so even in their own IDE, most of the time, when I bring up quick documentation it's nothing but the method signature. I wonder if they assigned CTRL-Q to it just so people would balk at habituating a shortcut that usually would quit. In my keymap quick doc is F1. https://www.jetbrains.com/help/idea/viewing-reference-information.html?keymap=GNOME#quick-doc-popup #IntelliJ
CTRL-Q