KF5KHtml in a ebuild is disabled, as a result it's impossible to select the tree view in a system settings config, even if kde-frameworks/khtml is installed. Reproducible: Always After editing the ebuild in a local overlay (remove "-DCMAKE_DISABLE_FIND_PACKAGE_KF5KHtml=ON" and add khtml dep), the problem is fixed for me. Perhaps this should be implemented with the USE flag, as in earlier versions (5.15).
It is gone and won't come back, upstream is removing KF5Html everywhere and we just followed suite one release earlier.
