How to switch the reference documentation in Qt Creator 4.2.0
I have downloaded both 5.7.1 and 5.2.1 kits. The default kit is 5.2.1, the project is in Qt 5.2.1. In project's editor, if I go into Help mode the documentation shown for the tooltip (F1) is pointing to 5.7.1. How can I switch it to 5.2.1?
Thank you for your help.