Created attachment 112384 [details] Screenshot of scrollbar https://cgit.kde.org/plasma-nm.git/commit/?id=0267a6a016b396ae6adf38c7c68b19841d5428e6 That commit fixed a similar issue in Dialog.qml. I think a similar solution would be applicable here, but I'm not a coder so forgive me if I'm wrong. See also https://bugs.kde.org/show_bug.cgi?id=390846 How to reproduce: 1. Go to System Settings → Workspace Theme. Choose Breeze, hit Apply. 2. (In System Settings) go to Desktop Theme. Choose Breeze Dark, hit Apply. 3. (Still in System Settings) go to Network → Connections 4. Resize the window so that you can see the faulty scrollbar (see screenshot). Add new connections if necessary. 5. Scrollbar is light grey and unapparent.
Git commit 7f44a45ffcf3f18309ff455152cd9b1e6834a6bd by Jan Grulich. Committed on 10/05/2018 at 13:58. Pushed by grulich into branch 'Plasma/5.12'. Use ScrollView from QtQuickControls in the main connection view M +1 -1 kcm/qml/main.qml https://commits.kde.org/plasma-nm/7f44a45ffcf3f18309ff455152cd9b1e6834a6bd
Cheers!