diff --git a/src/plugins/magiclamp/magiclamp_config.cpp b/src/plugins/magiclamp/magiclamp_config.cpp
index b967dc82ad..5c986a8a6c 100644
--- a/src/plugins/magiclamp/magiclamp_config.cpp
+++ b/src/plugins/magiclamp/magiclamp_config.cpp
@@ -25,21 +25,13 @@ K_PLUGIN_CLASS(KWin::MagicLampEffectConfig)
 namespace KWin
 {
 
-MagicLampEffectConfigForm::MagicLampEffectConfigForm(QWidget *parent)
-    : QWidget(parent)
-{
-    setupUi(this);
-}
-
 MagicLampEffectConfig::MagicLampEffectConfig(QObject *parent, const KPluginMetaData &data)
     : KCModule(parent, data)
-    , m_ui(widget())
 {
-    QVBoxLayout *layout = new QVBoxLayout(widget());
-    layout->addWidget(&m_ui);
+    m_ui.setupUi(widget());
 
     MagicLampConfig::instance(KWIN_CONFIG);
-    addConfig(MagicLampConfig::self(), &m_ui);
+    addConfig(MagicLampConfig::self(), widget());
 }
 
 void MagicLampEffectConfig::save()
diff --git a/src/plugins/magiclamp/magiclamp_config.h b/src/plugins/magiclamp/magiclamp_config.h
index fc50deb0fc..4c0f1c49b3 100644
--- a/src/plugins/magiclamp/magiclamp_config.h
+++ b/src/plugins/magiclamp/magiclamp_config.h
@@ -15,14 +15,6 @@
 
 namespace KWin
 {
-
-class MagicLampEffectConfigForm : public QWidget, public Ui::MagicLampEffectConfigForm
-{
-    Q_OBJECT
-public:
-    explicit MagicLampEffectConfigForm(QWidget *parent);
-};
-
 class MagicLampEffectConfig : public KCModule
 {
     Q_OBJECT
@@ -33,7 +25,7 @@ public Q_SLOTS:
     void save() override;
 
 private:
-    MagicLampEffectConfigForm m_ui;
+    Ui::MagicLampEffectConfigForm m_ui;
 };
 
 } // namespace
diff --git a/src/plugins/magnifier/magnifier_config.cpp b/src/plugins/magnifier/magnifier_config.cpp
index f42a014044..34290dbe67 100644
--- a/src/plugins/magnifier/magnifier_config.cpp
+++ b/src/plugins/magnifier/magnifier_config.cpp
@@ -30,22 +30,13 @@ K_PLUGIN_CLASS(KWin::MagnifierEffectConfig)
 
 namespace KWin
 {
-
-MagnifierEffectConfigForm::MagnifierEffectConfigForm(QWidget *parent)
-    : QWidget(parent)
-{
-    setupUi(this);
-}
-
 MagnifierEffectConfig::MagnifierEffectConfig(QObject *parent, const KPluginMetaData &data)
     : KCModule(parent, data)
-    , m_ui(widget())
 {
-    QVBoxLayout *layout = new QVBoxLayout(widget());
-    layout->addWidget(&m_ui);
+    m_ui.setupUi(widget());
 
     MagnifierConfig::instance(KWIN_CONFIG);
-    addConfig(MagnifierConfig::self(), &m_ui);
+    addConfig(MagnifierConfig::self(), widget());
 
     connect(m_ui.editor, &KShortcutsEditor::keyChange, this, &KCModule::markAsChanged);
 
diff --git a/src/plugins/magnifier/magnifier_config.h b/src/plugins/magnifier/magnifier_config.h
index bab274437d..227f4e408b 100644
--- a/src/plugins/magnifier/magnifier_config.h
+++ b/src/plugins/magnifier/magnifier_config.h
@@ -18,13 +18,6 @@ class KActionCollection;
 namespace KWin
 {
 
-class MagnifierEffectConfigForm : public QWidget, public Ui::MagnifierEffectConfigForm
-{
-    Q_OBJECT
-public:
-    explicit MagnifierEffectConfigForm(QWidget *parent);
-};
-
 class MagnifierEffectConfig : public KCModule
 {
     Q_OBJECT
@@ -35,7 +28,7 @@ public:
     void defaults() override;
 
 private:
-    MagnifierEffectConfigForm m_ui;
+    Ui::MagnifierEffectConfigForm m_ui;
     KActionCollection *m_actionCollection;
 };
 
diff --git a/src/plugins/mouseclick/mouseclick_config.cpp b/src/plugins/mouseclick/mouseclick_config.cpp
index ae866ef445..45ba8007aa 100644
--- a/src/plugins/mouseclick/mouseclick_config.cpp
+++ b/src/plugins/mouseclick/mouseclick_config.cpp
@@ -28,18 +28,10 @@ K_PLUGIN_CLASS(KWin::MouseClickEffectConfig)
 namespace KWin
 {
 
-MouseClickEffectConfigForm::MouseClickEffectConfigForm(QWidget *parent)
-    : QWidget(parent)
-{
-    setupUi(this);
-}
-
 MouseClickEffectConfig::MouseClickEffectConfig(QObject *parent, const KPluginMetaData &data)
     : KCModule(parent, data)
-    , m_ui(widget())
 {
-    QVBoxLayout *layout = new QVBoxLayout(widget());
-    layout->addWidget(&m_ui);
+    m_ui.setupUi(widget());
 
     connect(m_ui.editor, &KShortcutsEditor::keyChange, this, &KCModule::markAsChanged);
 
@@ -56,7 +48,7 @@ MouseClickEffectConfig::MouseClickEffectConfig(QObject *parent, const KPluginMet
     m_ui.editor->addCollection(m_actionCollection);
 
     MouseClickConfig::instance(KWIN_CONFIG);
-    addConfig(MouseClickConfig::self(), &m_ui);
+    addConfig(MouseClickConfig::self(), widget());
 }
 
 void MouseClickEffectConfig::save()
diff --git a/src/plugins/mouseclick/mouseclick_config.h b/src/plugins/mouseclick/mouseclick_config.h
index 9582665712..6fe11ef411 100644
--- a/src/plugins/mouseclick/mouseclick_config.h
+++ b/src/plugins/mouseclick/mouseclick_config.h
@@ -18,13 +18,6 @@ class KActionCollection;
 namespace KWin
 {
 
-class MouseClickEffectConfigForm : public QWidget, public Ui::MouseClickEffectConfigForm
-{
-    Q_OBJECT
-public:
-    explicit MouseClickEffectConfigForm(QWidget *parent);
-};
-
 class MouseClickEffectConfig : public KCModule
 {
     Q_OBJECT
@@ -34,7 +27,7 @@ public:
     void save() override;
 
 private:
-    MouseClickEffectConfigForm m_ui;
+    Ui::MouseClickEffectConfigForm m_ui;
     KActionCollection *m_actionCollection;
 };
 
diff --git a/src/plugins/mousemark/mousemark_config.cpp b/src/plugins/mousemark/mousemark_config.cpp
index ba354c6359..b49ae20a07 100644
--- a/src/plugins/mousemark/mousemark_config.cpp
+++ b/src/plugins/mousemark/mousemark_config.cpp
@@ -30,21 +30,13 @@ K_PLUGIN_CLASS(KWin::MouseMarkEffectConfig)
 namespace KWin
 {
 
-MouseMarkEffectConfigForm::MouseMarkEffectConfigForm(QWidget *parent)
-    : QWidget(parent)
-{
-    setupUi(this);
-}
-
 MouseMarkEffectConfig::MouseMarkEffectConfig(QObject *parent, const KPluginMetaData &data)
     : KCModule(parent, data)
-    , m_ui(widget())
 {
-    QVBoxLayout *layout = new QVBoxLayout(widget());
-    layout->addWidget(&m_ui);
+    m_ui.setupUi(widget());
 
     MouseMarkConfig::instance(KWIN_CONFIG);
-    addConfig(MouseMarkConfig::self(), &m_ui);
+    addConfig(MouseMarkConfig::self(), widget());
 
     // Shortcut config. The shortcut belongs to the component "kwin"!
     m_actionCollection = new KActionCollection(this, QStringLiteral("kwin"));
diff --git a/src/plugins/mousemark/mousemark_config.h b/src/plugins/mousemark/mousemark_config.h
index 670f887024..768aba2a1f 100644
--- a/src/plugins/mousemark/mousemark_config.h
+++ b/src/plugins/mousemark/mousemark_config.h
@@ -19,13 +19,6 @@ class KActionCollection;
 namespace KWin
 {
 
-class MouseMarkEffectConfigForm : public QWidget, public Ui::MouseMarkEffectConfigForm
-{
-    Q_OBJECT
-public:
-    explicit MouseMarkEffectConfigForm(QWidget *parent);
-};
-
 class MouseMarkEffectConfig : public KCModule
 {
     Q_OBJECT
@@ -38,7 +31,7 @@ public:
 private:
     void updateSpinBoxSuffix();
 
-    MouseMarkEffectConfigForm m_ui;
+    Ui::MouseMarkEffectConfigForm m_ui;
     KActionCollection *m_actionCollection;
 };
 
diff --git a/src/plugins/showpaint/showpaint_config.cpp b/src/plugins/showpaint/showpaint_config.cpp
index 70fffca600..4b1cd8afd5 100644
--- a/src/plugins/showpaint/showpaint_config.cpp
+++ b/src/plugins/showpaint/showpaint_config.cpp
@@ -24,9 +24,8 @@ namespace KWin
 
 ShowPaintEffectConfig::ShowPaintEffectConfig(QObject *parent, const KPluginMetaData &data)
     : KCModule(parent, data)
-    , m_ui(std::make_unique<Ui::ShowPaintEffectConfig>())
 {
-    m_ui->setupUi(widget());
+    m_ui.setupUi(widget());
 
     auto *actionCollection = new KActionCollection(this, QStringLiteral("kwin"));
 
@@ -40,20 +39,20 @@ ShowPaintEffectConfig::ShowPaintEffectConfig(QObject *parent, const KPluginMetaD
     KGlobalAccel::self()->setDefaultShortcut(toggleAction, {});
     KGlobalAccel::self()->setShortcut(toggleAction, {});
 
-    m_ui->shortcutsEditor->addCollection(actionCollection);
+    m_ui.shortcutsEditor->addCollection(actionCollection);
 
-    connect(m_ui->shortcutsEditor, &KShortcutsEditor::keyChange, this, &KCModule::markAsChanged);
+    connect(m_ui.shortcutsEditor, &KShortcutsEditor::keyChange, this, &KCModule::markAsChanged);
 }
 
 void ShowPaintEffectConfig::save()
 {
     KCModule::save();
-    m_ui->shortcutsEditor->save();
+    m_ui.shortcutsEditor->save();
 }
 
 void ShowPaintEffectConfig::defaults()
 {
-    m_ui->shortcutsEditor->allDefault();
+    m_ui.shortcutsEditor->allDefault();
     KCModule::defaults();
 }
 
diff --git a/src/plugins/showpaint/showpaint_config.h b/src/plugins/showpaint/showpaint_config.h
index d752f870b8..63463ceefd 100644
--- a/src/plugins/showpaint/showpaint_config.h
+++ b/src/plugins/showpaint/showpaint_config.h
@@ -28,7 +28,7 @@ public Q_SLOTS:
     void defaults() override;
 
 private:
-    std::unique_ptr<Ui::ShowPaintEffectConfig> m_ui;
+    Ui::ShowPaintEffectConfig m_ui;
 };
 
 } // namespace KWin
diff --git a/src/plugins/thumbnailaside/thumbnailaside_config.cpp b/src/plugins/thumbnailaside/thumbnailaside_config.cpp
index f3afbc9989..fa567c6cbe 100644
--- a/src/plugins/thumbnailaside/thumbnailaside_config.cpp
+++ b/src/plugins/thumbnailaside/thumbnailaside_config.cpp
@@ -29,19 +29,10 @@ K_PLUGIN_CLASS(KWin::ThumbnailAsideEffectConfig)
 
 namespace KWin
 {
-
-ThumbnailAsideEffectConfigForm::ThumbnailAsideEffectConfigForm(QWidget *parent)
-    : QWidget(parent)
-{
-    setupUi(this);
-}
-
 ThumbnailAsideEffectConfig::ThumbnailAsideEffectConfig(QObject *parent, const KPluginMetaData &data)
     : KCModule(parent, data)
-    , m_ui(widget())
 {
-    QVBoxLayout *layout = new QVBoxLayout(widget());
-    layout->addWidget(&m_ui);
+    m_ui.setupUi(widget());
 
     connect(m_ui.editor, &KShortcutsEditor::keyChange, this, &KCModule::markAsChanged);
 
diff --git a/src/plugins/thumbnailaside/thumbnailaside_config.h b/src/plugins/thumbnailaside/thumbnailaside_config.h
index ec0f72c04e..481d873693 100644
--- a/src/plugins/thumbnailaside/thumbnailaside_config.h
+++ b/src/plugins/thumbnailaside/thumbnailaside_config.h
@@ -17,14 +17,6 @@ class KActionCollection;
 
 namespace KWin
 {
-
-class ThumbnailAsideEffectConfigForm : public QWidget, public Ui::ThumbnailAsideEffectConfigForm
-{
-    Q_OBJECT
-public:
-    explicit ThumbnailAsideEffectConfigForm(QWidget *parent);
-};
-
 class ThumbnailAsideEffectConfig : public KCModule
 {
     Q_OBJECT
@@ -34,7 +26,7 @@ public:
     void save() override;
 
 private:
-    ThumbnailAsideEffectConfigForm m_ui;
+    Ui::ThumbnailAsideEffectConfigForm m_ui;
     KActionCollection *m_actionCollection;
 };
 
diff --git a/src/plugins/trackmouse/trackmouse_config.cpp b/src/plugins/trackmouse/trackmouse_config.cpp
index 2f2ad33a05..89b45a6aff 100644
--- a/src/plugins/trackmouse/trackmouse_config.cpp
+++ b/src/plugins/trackmouse/trackmouse_config.cpp
@@ -32,21 +32,13 @@ namespace KWin
 
 static const QString s_toggleTrackMouseActionName = QStringLiteral("TrackMouse");
 
-TrackMouseEffectConfigForm::TrackMouseEffectConfigForm(QWidget *parent)
-    : QWidget(parent)
-{
-    setupUi(this);
-}
-
 TrackMouseEffectConfig::TrackMouseEffectConfig(QObject *parent, const KPluginMetaData &data)
     : KCModule(parent, data)
 {
     TrackMouseConfig::instance(KWIN_CONFIG);
-    m_ui = new TrackMouseEffectConfigForm(widget());
-    QVBoxLayout *layout = new QVBoxLayout(widget());
-    layout->addWidget(m_ui);
+    m_ui.setupUi(widget());
 
-    addConfig(TrackMouseConfig::self(), m_ui);
+    addConfig(TrackMouseConfig::self(), widget());
 
     m_actionCollection = new KActionCollection(this, QStringLiteral("kwin"));
     m_actionCollection->setComponentDisplayName(i18n("KWin"));
@@ -60,7 +52,7 @@ TrackMouseEffectConfig::TrackMouseEffectConfig(QObject *parent, const KPluginMet
     KGlobalAccel::self()->setDefaultShortcut(a, QList<QKeySequence>());
     KGlobalAccel::self()->setShortcut(a, QList<QKeySequence>());
 
-    connect(m_ui->shortcut, &KKeySequenceWidget::keySequenceChanged,
+    connect(m_ui.shortcut, &KKeySequenceWidget::keySequenceChanged,
             this, &TrackMouseEffectConfig::shortcutChanged);
 }
 
@@ -75,7 +67,7 @@ void TrackMouseEffectConfig::load()
     if (QAction *a = m_actionCollection->action(s_toggleTrackMouseActionName)) {
         auto shortcuts = KGlobalAccel::self()->shortcut(a);
         if (!shortcuts.isEmpty()) {
-            m_ui->shortcut->setKeySequence(shortcuts.first());
+            m_ui.shortcut->setKeySequence(shortcuts.first());
         }
     }
 }
@@ -93,7 +85,7 @@ void TrackMouseEffectConfig::save()
 void TrackMouseEffectConfig::defaults()
 {
     KCModule::defaults();
-    m_ui->shortcut->clearKeySequence();
+    m_ui.shortcut->clearKeySequence();
 }
 
 void TrackMouseEffectConfig::shortcutChanged(const QKeySequence &seq)
diff --git a/src/plugins/trackmouse/trackmouse_config.h b/src/plugins/trackmouse/trackmouse_config.h
index 5091d83571..4ba1d95b58 100644
--- a/src/plugins/trackmouse/trackmouse_config.h
+++ b/src/plugins/trackmouse/trackmouse_config.h
@@ -18,14 +18,6 @@ class KActionCollection;
 
 namespace KWin
 {
-
-class TrackMouseEffectConfigForm : public QWidget, public Ui::TrackMouseEffectConfigForm
-{
-    Q_OBJECT
-public:
-    explicit TrackMouseEffectConfigForm(QWidget *parent);
-};
-
 class TrackMouseEffectConfig : public KCModule
 {
     Q_OBJECT
@@ -41,7 +33,7 @@ private Q_SLOTS:
     void shortcutChanged(const QKeySequence &seq);
 
 private:
-    TrackMouseEffectConfigForm *m_ui;
+    Ui::TrackMouseEffectConfigForm m_ui;
     KActionCollection *m_actionCollection;
 };
 
diff --git a/src/plugins/zoom/zoom_config.cpp b/src/plugins/zoom/zoom_config.cpp
index 7e63bc7e00..6040cb137d 100644
--- a/src/plugins/zoom/zoom_config.cpp
+++ b/src/plugins/zoom/zoom_config.cpp
@@ -28,25 +28,15 @@ K_PLUGIN_CLASS(KWin::ZoomEffectConfig)
 
 namespace KWin
 {
-
-ZoomEffectConfigForm::ZoomEffectConfigForm(QWidget *parent)
-    : QWidget(parent)
-{
-    setupUi(this);
-}
-
 ZoomEffectConfig::ZoomEffectConfig(QObject *parent, const KPluginMetaData &data)
     : KCModule(parent, data)
 {
     ZoomConfig::instance(KWIN_CONFIG);
-    m_ui = new ZoomEffectConfigForm(widget());
+    m_ui.setupUi(widget());
 
-    QVBoxLayout *layout = new QVBoxLayout(widget());
-    layout->addWidget(m_ui);
+    addConfig(ZoomConfig::self(), widget());
 
-    addConfig(ZoomConfig::self(), m_ui);
-
-    connect(m_ui->editor, &KShortcutsEditor::keyChange, this, &KCModule::markAsChanged);
+    connect(m_ui.editor, &KShortcutsEditor::keyChange, this, &KCModule::markAsChanged);
 
 #if !HAVE_ACCESSIBILITY
     m_ui->kcfg_EnableFocusTracking->setVisible(false);
@@ -117,12 +107,12 @@ ZoomEffectConfig::ZoomEffectConfig(QObject *parent, const KPluginMetaData &data)
     KGlobalAccel::self()->setDefaultShortcut(a, QList<QKeySequence>() << (Qt::META | Qt::Key_F6));
     KGlobalAccel::self()->setShortcut(a, QList<QKeySequence>() << (Qt::META | Qt::Key_F6));
 
-    m_ui->editor->addCollection(actionCollection);
+    m_ui.editor->addCollection(actionCollection);
 }
 
 void ZoomEffectConfig::save()
 {
-    m_ui->editor->save(); // undo() will restore to this state from now on
+    m_ui.editor->save(); // undo() will restore to this state from now on
     KCModule::save();
     OrgKdeKwinEffectsInterface interface(QStringLiteral("org.kde.KWin"),
                                          QStringLiteral("/Effects"),
diff --git a/src/plugins/zoom/zoom_config.h b/src/plugins/zoom/zoom_config.h
index 80d8aebfe0..ddd3c8ac8b 100644
--- a/src/plugins/zoom/zoom_config.h
+++ b/src/plugins/zoom/zoom_config.h
@@ -16,14 +16,6 @@
 
 namespace KWin
 {
-
-class ZoomEffectConfigForm : public QWidget, public Ui::ZoomEffectConfigForm
-{
-    Q_OBJECT
-public:
-    explicit ZoomEffectConfigForm(QWidget *parent = nullptr);
-};
-
 class ZoomEffectConfig : public KCModule
 {
     Q_OBJECT
@@ -34,7 +26,7 @@ public Q_SLOTS:
     void save() override;
 
 private:
-    ZoomEffectConfigForm *m_ui;
+    Ui::ZoomEffectConfigForm m_ui;
     enum MouseTracking {
         MouseCentred = 0,
         MouseProportional = 1,