With qqc2 changing 'highlighted' property of Button control does not have any effects: Button { highlighted: true } when it works just fine in other styles
Confirmed.
A possibly relevant merge request was started @ https://invent.kde.org/frameworks/qqc2-desktop-style/-/merge_requests/64
Git commit e473068e2e032daf2a40f1eea3315ca1fa030fe5 by Nate Graham. Committed on 20/03/2021 at 19:17. Pushed by ndavis into branch 'master'. Respect highlighted property Test are adjusted accordingly. FIXED-IN: 5.81 M +1 -1 org.kde.desktop/Button.qml M +1 -1 org.kde.desktop/ToolButton.qml M +13 -1 tests/ToolButton.qml https://invent.kde.org/frameworks/qqc2-desktop-style/commit/e473068e2e032daf2a40f1eea3315ca1fa030fe5