Javadoc Auto Pop-up won't turn off

In my installation of IntelliJ IDEA 2016.3, I read that I could enable automatic pop-up of javadoc when I hover over an object name in the IDE.  I did so, but now it often obscures the other popups, such as the advice about a syntax error, etc.  This is so annoying that I want to go back and turn off the auto pop-up.  When I go to Settings -> Editor -> General -> Code Completion and un-check the 'Autopopup documentation in (ms)' option, it has no effect; the documentation keeps on popping up when I hover over object names and methods in my code.

How can I disable this feature?