How to change font in popup documentaion?

Question

How to change the font used in Quick Documentation?

Answer

Font series in Quick Documentaion follows global IDE font settings.

You can change this by enabling "Custom Font" in Settings | Appearance & Behavior | Appearance and specifying the font you prefer to use. 

If you just want to change the font size, click the three-dots icon in the popup window and select "Adjust font size".