Check out my Github I've got some real cool programs and scripts there https://github.com/DSMJR/dsmrepo.
]]>I'd look at least for *kcm_lookandfeel* in either /usr/bin or /usr/lib/qt/plugins, and *kcm_desktoptheme* (maybe that's both defined in the same kcm.so, but I don't know these packages). Everything else I can see at this point might be because it can't load those for whatever reason.
]]>This is me going to the "workspace theme" (it's not just this settings group).
[user@archlinux ~]$ systemsettings5
org.kde.kcoreaddons: Error loading plugin "kcm_lookandfeel" "The shared library was not found."
Plugin search paths are ("/usr/lib/qt/plugins", "/usr/bin")
The environment variable QT_PLUGIN_PATH might be not correctly set
file:///usr/lib/qt/qml/org/kde/kirigami.2/private/globaltoolbar/PageRowGlobalToolBarUI.qml:91: TypeError: Cannot read property 'globalToolBarStyle' of null
"file:///usr/share/kpackage/kcms/kcm_lookandfeel/contents/ui/main.qml"
"Error loading QML file.\n27: Type KCM.GridViewKCM unavailable\n113: Type KCM.GridView unavailable\n32: Type QtControls.ScrollView unavailable\n26: module \"org.kde.kirigami\" version 2.9 is not installed\n"
file:///usr/lib/qt/qml/org/kde/kirigami.2/PageRow.qml:211: TypeError: Cannot read property 'createObject' of null
org.kde.kcoreaddons: Error loading plugin "kcm_desktoptheme" "The shared library was not found."
Plugin search paths are ("/usr/lib/qt/plugins", "/usr/bin")
The environment variable QT_PLUGIN_PATH might be not correctly set
file:///usr/lib/qt/qml/org/kde/kirigami.2/private/globaltoolbar/PageRowGlobalToolBarUI.qml:91: TypeError: Cannot read property 'globalToolBarStyle' of null
"file:///usr/share/kpackage/kcms/kcm_desktoptheme/contents/ui/main.qml"
"Error loading QML file.\n29: Type KCM.GridViewKCM unavailable\n113: Type KCM.GridView unavailable\n32: Type QtControls.ScrollView unavailable\n26: module \"org.kde.kirigami\" version 2.9 is not installed\n"
file:///usr/lib/qt/qml/org/kde/kirigami.2/PageRow.qml:211: TypeError: Cannot read property 'createObject' of null
org.kde.kcoreaddons: Error loading plugin "kcm_cursortheme" "The shared library was not found."
Plugin search paths are ("/usr/lib/qt/plugins", "/usr/bin")
The environment variable QT_PLUGIN_PATH might be not correctly set
file:///usr/lib/qt/qml/org/kde/kirigami.2/private/globaltoolbar/PageRowGlobalToolBarUI.qml:91: TypeError: Cannot read property 'globalToolBarStyle' of null
"file:///usr/share/kpackage/kcms/kcm_cursortheme/contents/ui/main.qml"
"Error loading QML file.\n30: Type KCM.GridViewKCM unavailable\n113: Type KCM.GridView unavailable\n32: Type QtControls.ScrollView unavailable\n26: module \"org.kde.kirigami\" version 2.9 is not installed\n"
file:///usr/lib/qt/qml/org/kde/kirigami.2/PageRow.qml:211: TypeError: Cannot read property 'createObject' of null
org.kde.kcoreaddons: Error loading plugin "kcm_splashscreen" "The shared library was not found."
Plugin search paths are ("/usr/lib/qt/plugins", "/usr/bin")
The environment variable QT_PLUGIN_PATH might be not correctly set
file:///usr/lib/qt/qml/org/kde/kirigami.2/private/globaltoolbar/PageRowGlobalToolBarUI.qml:91: TypeError: Type error
"file:///usr/share/kpackage/kcms/kcm_splashscreen/contents/ui/main.qml"
"Error loading QML file.\n26: Type KCM.GridViewKCM unavailable\n113: Type KCM.GridView unavailable\n32: Type QtControls.ScrollView unavailable\n26: module \"org.kde.kirigami\" version 2.9 is not installed\n"
file:///usr/lib/qt/qml/org/kde/kirigami.2/PageRow.qml:211: TypeError: Type error
In Desktop behavior/screen locking inside the appearance tab shows this error in the tab.
Error:Could not load:file:///usr/share/plasma/wallpaers/org.kde.image/contents/ui/config.qml:243 Type QtControls2.ScrollView unavailable
file:///usr/lib/qt/qml/QtQuick/Controls.2/org.kde.desktop/ScrollView.qml:26 module "org.kde.kirigami" version 2.9 is not installed