diff --git a/kcmkwin/kwindecoration/decorationmodel.cpp b/kcmkwin/kwindecoration/decorationmodel.cpp
--- a/kcmkwin/kwindecoration/decorationmodel.cpp
+++ b/kcmkwin/kwindecoration/decorationmodel.cpp
@@ -170,7 +170,7 @@
         }
         Data data;
         data.pluginName = info.pluginName();
-        data.visibleName = info.name().isEmpty() ? info.pluginName() : info.name();
+        data.visibleName = data.themeName = info.name().isEmpty() ? info.pluginName() : info.name();
         data.configuration = config;
 
         m_plugins.emplace_back(std::move(data));
@@ -182,7 +182,11 @@
 {
     auto it = std::find_if(m_plugins.cbegin(), m_plugins.cend(),
         [pluginName, themeName](const Data &d) {
-            return d.pluginName == pluginName && d.themeName == themeName;
+            if (themeName.isEmpty()) {
+                return d.pluginName == pluginName;
+            } else {
+                return d.pluginName == pluginName && d.themeName == themeName;
+            }
         }
     );
     if (it == m_plugins.cend()) {
diff --git a/kcmkwin/kwindecoration/kcm.cpp b/kcmkwin/kwindecoration/kcm.cpp
--- a/kcmkwin/kwindecoration/kcm.cpp
+++ b/kcmkwin/kwindecoration/kcm.cpp
@@ -314,7 +314,11 @@
     m_ui->borderSizesCombo->setCurrentIndex(m_ui->borderSizesCombo->findData(border));
 
     int themeIndex = m_proxyModel->mapFromSource(m_model->findDecoration(plugin, theme)).row();
-    m_quickView->rootContext()->setContextProperty("initialThemeIndex", themeIndex);
+    if (auto listView = m_quickView->rootObject()->findChild<QQuickItem*>("listView")) {
+        listView->setProperty("currentIndex", themeIndex);
+    } else {
+        m_quickView->rootContext()->setContextProperty("initialThemeIndex", themeIndex);
+    }
 
     // buttons
     const auto &left = readDecorationButtons(config, "ButtonsOnLeft", QVector<KDecoration2::DecorationButtonType >{