Hello! I'm using KDE Plasma 5 (5.3.1 with Frameworks 5.10.0). My personal settings of Dolphin for the navigation are to open folders by double clicking. In KDE 4.xx.x when this option is selected all items were opened by double clicking. In Plasma 5 these settings seems to be applied only for some parts of the DE. Items located on the desktop (folders, files) are still opened by single click and KCMs in the System settings too. Reproducible: Always