It would be great to have font size configurable in documentation viewer. Currently documentation font size is fixed but different for QtHelp, CMake and Man page. These fonts do not depend on system settings (neither in XFCE, nor in KDE). I find default documentation fonts too small and unusable. So there are 2 ways to solve the problem: make font size adjustable in KDevelop or honor system settings. I have attached relevant screenshots a while ago here: https://bugs.kde.org/show_bug.cgi?id=285162
Let's continue to discuss on the original bug then. *** This bug has been marked as a duplicate of bug 285162 ***