Xcode Quick Help displays “No Quick Help” when viewing a single file

Question

The quick help feature is working just fine when I open an Xcode project, however when opening a file (e.g. abc.swift) that\'s not in an open project, the documentation does not

Answer 1

This is what worked for me. I closed Xcode and then deleted ~/Library/Caches/com.apple.dt.Xcode. Then I reopened Xcode and checked. It worked after that. I'm currently on Xcode 10.2.1.