There is a checkbox "Show icons on buttons" in Widget Style. this setting is respected by both kde4 and KF5-based applications, but not by KCMs (regardless of whether they's started from kcmshell or standalone). Reproducible: Always Steps to Reproduce: 1. Go to Systemsettings -> Application Style -> Widget Style -> Fine Tuning 2. Uncheck "Show icons on buttons" 3. Restart Systemsettings 4. Open any KCM Actual Results: Buttons still have icons Expected Results: Buttons do not have icons This bug was present since at least 5.2, so it's not a regression.
probably not following the hint QStyle::SH_DialogButtonBox_ButtonsHaveIcons
Cannot reproduce since a long time.
I can confirm that the setting is respected by KCMs now.