> 3. I do not see any options for kreadconfig5 to dump existing groups > nor existing keys. > It seems to require that you know exactly what groups and keys exist in > advance. > Am I missing something?
The settings are stored in ~/.config/okularrc or similar. In that file search for [Recent Files]. It looks like there is no key that controls the count, instead the application is responsible for chosing a sensible value. See setMaxCount() method: https://api.kde.org/frameworks/kconfigwidgets/html/classKRecentFilesAction.html#a9f41c649046f251ec8d4020aaa3ba3e5
