diff --git a/share/qtcreator/templates/wizards/projects/qtquickapplication/scroll/wizard.json b/share/qtcreator/templates/wizards/projects/qtquickapplication/scroll/wizard.json
index 5ebf0852168..c7acc28dddf 100644
--- a/share/qtcreator/templates/wizards/projects/qtquickapplication/scroll/wizard.json
+++ b/share/qtcreator/templates/wizards/projects/qtquickapplication/scroll/wizard.json
@@ -160,17 +160,9 @@
                     "type": "ComboBox",
                     "data":
                     {
-                        "index": 1,
+                        "index": 0,
                         "items":
                         [
-                            {
-                                "trKey": "Default",
-                                "value":
-                                {
-                                    "QtQuickControlsStyle": "Default",
-                                    "QtQuickControlsStyleTheme": ""
-                                }
-                            },
                             {
                                 "trKey": "Material Light",
                                 "value":
diff --git a/share/qtcreator/templates/wizards/projects/qtquickapplication/stack/wizard.json b/share/qtcreator/templates/wizards/projects/qtquickapplication/stack/wizard.json
index 2f0d0353f54..572292ec757 100644
--- a/share/qtcreator/templates/wizards/projects/qtquickapplication/stack/wizard.json
+++ b/share/qtcreator/templates/wizards/projects/qtquickapplication/stack/wizard.json
@@ -178,17 +178,9 @@
                     "type": "ComboBox",
                     "data":
                     {
-                        "index": 1,
+                        "index": 0,
                         "items":
                         [
-                            {
-                                "trKey": "Default",
-                                "value":
-                                {
-                                    "QtQuickControlsStyle": "Default",
-                                    "QtQuickControlsStyleTheme": ""
-                                }
-                            },
                             {
                                 "trKey": "Material Light",
                                 "value":
diff --git a/share/qtcreator/templates/wizards/projects/qtquickapplication/swipe/wizard.json b/share/qtcreator/templates/wizards/projects/qtquickapplication/swipe/wizard.json
index 804916d77a8..4f7e8f14799 100644
--- a/share/qtcreator/templates/wizards/projects/qtquickapplication/swipe/wizard.json
+++ b/share/qtcreator/templates/wizards/projects/qtquickapplication/swipe/wizard.json
@@ -178,17 +178,9 @@
                     "type": "ComboBox",
                     "data":
                     {
-                        "index": 1,
+                        "index": 0,
                         "items":
                         [
-                            {
-                                "trKey": "Default",
-                                "value":
-                                {
-                                    "QtQuickControlsStyle": "Default",
-                                    "QtQuickControlsStyleTheme": ""
-                                }
-                            },
                             {
                                 "trKey": "Material Light",
                                 "value":
diff --git a/src/plugins/qmldesigner/components/componentcore/changestyleaction.cpp b/src/plugins/qmldesigner/components/componentcore/changestyleaction.cpp
index 1c1eba4944e..0b73a1f39de 100644
--- a/src/plugins/qmldesigner/components/componentcore/changestyleaction.cpp
+++ b/src/plugins/qmldesigner/components/componentcore/changestyleaction.cpp
@@ -64,11 +64,18 @@ QWidget *ChangeStyleWidgetAction::createWidget(QWidget *parent)
 {
     auto comboBox = new QComboBox(parent);
     comboBox->setToolTip(tr(enabledTooltip));
+    // The Default style was renamed to Basic in Qt 6. In Qt 6, "Default"
+    // will result in a platform-specific style being chosen.
+    comboBox->addItem("Basic");
     comboBox->addItem("Default");
     comboBox->addItem("Fusion");
     comboBox->addItem("Imagine");
+    if (Utils::HostOsInfo::isMacHost())
+        comboBox->addItem("macOS");
     comboBox->addItem("Material");
     comboBox->addItem("Universal");
+    if (Utils::HostOsInfo::isWindowsHost())
+        comboBox->addItem("Windows");
     comboBox->setEditable(true);
     comboBox->setCurrentIndex(0);
 
@@ -132,7 +139,7 @@ void ChangeStyleAction::currentContextChanged(const SelectionContext &selectionC
 
         if (Utils::FilePath::fromString(confFileName).exists()) {
             QSettings infiFile(confFileName, QSettings::IniFormat);
-            m_action->handleModelUpdate(infiFile.value("Controls/Style", "Default").toString());
+            m_action->handleModelUpdate(infiFile.value("Controls/Style", "Basic").toString());
         } else {
             m_action->handleModelUpdate("");
         }
diff --git a/src/plugins/qmldesigner/designercore/instances/puppetcreator.cpp b/src/plugins/qmldesigner/designercore/instances/puppetcreator.cpp
index acf3083b3e8..8295a0346cf 100644
--- a/src/plugins/qmldesigner/designercore/instances/puppetcreator.cpp
+++ b/src/plugins/qmldesigner/designercore/instances/puppetcreator.cpp
@@ -487,7 +487,7 @@ QProcessEnvironment PuppetCreator::processEnvironment() const
 #else
     const QString controlsStyle;
 #endif
-    if (!controlsStyle.isEmpty() && controlsStyle != "Default") {
+    if (!controlsStyle.isEmpty()) {
         environment.set("QT_QUICK_CONTROLS_STYLE", controlsStyle);
         environment.set("QT_LABS_CONTROLS_STYLE", controlsStyle);
     }
@@ -498,13 +498,6 @@ QProcessEnvironment PuppetCreator::processEnvironment() const
 
     const QString styleConfigFileName = getStyleConfigFileName();
 
-    /* QT_QUICK_CONTROLS_CONF is not supported for Qt Version < 5.8.1,
-     * but we can manually at least set the correct style. */
-    if (!styleConfigFileName.isEmpty()) {
-        QSettings infiFile(styleConfigFileName, QSettings::IniFormat);
-        environment.set("QT_QUICK_CONTROLS_STYLE", infiFile.value("Controls/Style", "Default").toString());
-    }
-
     if (!m_qrcMapping.isEmpty()) {
         environment.set("QMLDESIGNER_RC_PATHS", m_qrcMapping);
     }