When dolphin is run in cinnamon, you need to double-click items to open them, even though it's set to use single-click in the KDE system settings. It uses single-click when run in KDE however.
Dolphin will use whatever the QStyle returns. I suspect the Cinnamon style has higher priority than the Plasma one. How do you use the Cinnamon filemanager (sorry, don't know how it's called)? Single or double click?
(In reply to Elvis Angelaccio from comment #1) > Dolphin will use whatever the QStyle returns. I suspect the Cinnamon style > has higher priority than the Plasma one. > > How do you use the Cinnamon filemanager (sorry, don't know how it's called)? > Single or double click? I've tried changing to single click in Nemo, but Dolphin still requires double clicking.
I have the same problem on openSUSE 42.2. Nemo is set to single-click, KDE is set to single-click (in ~/.kde4/share/config/kdeglobals and ~/.config/kdeglobals). Single-click in Dolphin works, if logged into Plasma 5 session, but it fails if logged into Cinnamon.
Please use qt5ct if your desktop does not offer a Qt integration plugin.