Operating System: Kubuntu 18.10 KDE Plasma Version: 5.15.3 KDE Frameworks Version: 5.54.0 Qt Version: 5.11.1 Kernel Version: 4.18.0-17-generic OS Type: 64-bit After you enable transparency in the Breeze config, you can no longer disable it. 1. Enable trasparency in the widget theme, using slider. 2. Observe transparent menus. 3. Disable transparency, using slider. 4. Transparency remains.
Error. I thought the minimum was opaque - it's actually most transparent. Not intuitive, but works fine.