diff --git a/src/main/java/viewtify/model/NamedPreferences.java b/src/main/java/viewtify/model/NamedPreferences.java
deleted file mode 100644
index b37311516..000000000
--- a/src/main/java/viewtify/model/NamedPreferences.java
+++ /dev/null
@@ -1,32 +0,0 @@
-/*
- * Copyright (C) 2023 Nameless Production Committee
- *
- * Licensed under the MIT License (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *          http://opensource.org/licenses/mit-license.php
- */
-package viewtify.model;
-
-import kiss.Managed;
-import kiss.Storable;
-
-@Managed
-public class NamedPreferences extends Preferences {
-
-    /** The user defined name. */
-    public final Preference<String> name = initialize("");
-
-    Storable container;
-
-    /**
-     * {@inheritDoc}
-     */
-    @Override
-    public Preferences store() {
-        container.store();
-        System.out.println("Store " + this);
-        return this;
-    }
-}
diff --git a/src/main/java/viewtify/model/Preferences.java b/src/main/java/viewtify/model/Preferences.java
index 5d32ad978..563c82312 100644
--- a/src/main/java/viewtify/model/Preferences.java
+++ b/src/main/java/viewtify/model/Preferences.java
@@ -27,15 +27,17 @@
 import kiss.Storable;
 import kiss.Variable;
 import kiss.WiseFunction;
-import viewtify.Viewtify;
 
 public abstract class Preferences implements Storable<Preferences>, Extensible {
 
     /** The cache for preferences. */
-    private static final Map<String, Preferences> cache = new ConcurrentHashMap();
+    private static final Map<Class, PreferencesList> CACHE = new ConcurrentHashMap();
+
+    /** The user defined name. */
+    public final Preference<String> name = initialize("");
 
-    /** The preference id. */
-    private String id;
+    /** The grouping container. */
+    Storable container;
 
     /**
      * Hide constructor.
@@ -108,31 +110,12 @@ protected final <V> Preference<V> initialize(Variable<V> defaultValue) {
     }
 
     /**
-     * Synchronize data from/to source.
-     */
-    void sync() {
-        Viewtify.UserPreference.observing().to(x -> {
-            // Not all property values are preserved in the restore source, so they must always be
-            // reset before restoring. If not reset, some properties may continue to apply the
-            // previous user's values to the new user.
-            reset();
-            restore();
-        });
-        auto();
-    }
-
-    /**
-     * Synchronize data from/to source.
+     * {@inheritDoc}
      */
-    void sync2() {
-        Viewtify.UserPreference.observing().to(x -> {
-            // Not all property values are preserved in the restore source, so they must always be
-            // reset before restoring. If not reset, some properties may continue to apply the
-            // previous user's values to the new user.
-            reset();
-            restore();
-        });
-        auto();
+    @Override
+    public Preferences store() {
+        container.store();
+        return this;
     }
 
     /**
@@ -177,15 +160,7 @@ private <V> Variable<Preference<V>> findBy(Property property) {
     }
 
     /**
-     * {@inheritDoc}
-     */
-    @Override
-    public String locate() {
-        return Viewtify.UserPreference.exact().file(id + ".json").path();
-    }
-
-    /**
-     * Get the user preferences by type.
+     * Search the user preference of the specified type.
      * 
      * @param <P>
      * @param type
@@ -196,46 +171,40 @@ public static <P extends Preferences> P of(Class<P> type) {
     }
 
     /**
-     * Get the user preferences by type and key.
+     * Search the user preference of the specified type and name.
      * 
      * @param <P>
      * @param type
-     * @param key
      * @return
      */
-    public static <P extends Preferences> P of(Class<P> type, String key) {
-        String id = type.getName();
-        if (key != null) {
-            id = id + "@" + key;
-        }
-
-        return (P) cache.computeIfAbsent(id, x -> {
-            Preferences prefs = I.make(type);
-            prefs.id = x;
-            prefs.sync();
-            return prefs;
-        });
-    }
+    public static <P extends Preferences> P of(Class<P> type, String name) {
+        name = Objects.requireNonNullElse(name, "");
 
-    private static final Map<Class, PreferencesList> CACHE = new ConcurrentHashMap();
-
-    public static <P extends NamedPreferences> P by(Class<P> type, String key) {
-        PreferencesList<P> list = list(type);
+        PreferencesList<P> list = CACHE.computeIfAbsent(type, PreferencesList::new);
         for (P preferences : list) {
-            if (preferences.name.is(key)) {
+            if (preferences.name.is(name)) {
                 return preferences;
             }
         }
 
         P named = I.make(type);
-        named.name.set(key);
+        named.name.set(name);
         named.container = list;
+        named.auto();
+
         list.add(named);
 
         return named;
     }
 
-    public static <P extends Preferences> PreferencesList<P> list(Class<P> type) {
+    /**
+     * Search all user preferences of the specified type.
+     * 
+     * @param <P>
+     * @param type
+     * @return
+     */
+    public static <P extends Preferences> List<P> all(Class<P> type) {
         return CACHE.computeIfAbsent(type, PreferencesList::new);
     }
 
diff --git a/src/main/java/viewtify/model/PreferencesList.java b/src/main/java/viewtify/model/PreferencesList.java
index 5c24f062b..9446a7864 100644
--- a/src/main/java/viewtify/model/PreferencesList.java
+++ b/src/main/java/viewtify/model/PreferencesList.java
@@ -9,22 +9,18 @@
  */
 package viewtify.model;
 
-import java.util.ArrayList;
-
-import javafx.collections.ModifiableObservableListBase;
+import java.util.concurrent.CopyOnWriteArrayList;
 
 import kiss.Managed;
 import kiss.Storable;
 import viewtify.Viewtify;
 
-final class PreferencesList<E extends Preferences> extends ModifiableObservableListBase<E> implements Storable<PreferencesList<E>> {
+@SuppressWarnings("serial")
+final class PreferencesList<E extends Preferences> extends CopyOnWriteArrayList<E> implements Storable<PreferencesList<E>> {
 
     /** The model id. */
     private final String id;
 
-    /** The actual container. */
-    private final ArrayList<E> list = new ArrayList();
-
     /**
      * Hide constructor.
      */
@@ -41,67 +37,19 @@ final class PreferencesList<E extends Preferences> extends ModifiableObservableL
             }
         }
 
-        sync();
-    }
-
-    /**
-     * Synchronize data from/to source.
-     */
-    protected final void sync() {
+        // Synchronize data from/to source.
         Viewtify.UserPreference.observing().to(x -> {
             // Not all property values are preserved in the restore source, so they must always be
             // reset before restoring. If not reset, some properties may continue to apply the
             // previous user's values to the new user.
             clear();
             restore();
-        });
-    }
-
-    /**
-     * {@inheritDoc}
-     */
-    @Override
-    public E get(int index) {
-        return list.get(index);
-    }
-
-    /**
-     * {@inheritDoc}
-     */
-    @Override
-    public int size() {
-        return list.size();
-    }
 
-    /**
-     * {@inheritDoc}
-     */
-    @Override
-    protected void doAdd(int index, E model) {
-        if (model != null) {
-            System.out.println("Add " + model);
-            model.sync2();
-            list.add(index, model);
-        }
-    }
-
-    /**
-     * {@inheritDoc}
-     */
-    @Override
-    protected E doSet(int index, E model) {
-        System.out.println("Set " + model);
-        model.sync2();
-
-        return list.set(index, model);
-    }
-
-    /**
-     * {@inheritDoc}
-     */
-    @Override
-    protected E doRemove(int model) {
-        return list.remove(model);
+            for (E item : this) {
+                item.container = this;
+                item.auto();
+            }
+        });
     }
 
     /**
diff --git a/src/main/java/viewtify/ui/calendar/CalendarSettingView.java b/src/main/java/viewtify/ui/calendar/CalendarSettingView.java
index 3c4839308..bd02688c1 100644
--- a/src/main/java/viewtify/ui/calendar/CalendarSettingView.java
+++ b/src/main/java/viewtify/ui/calendar/CalendarSettingView.java
@@ -122,7 +122,7 @@ protected ViewDSL declareUI() {
          */
         @Override
         protected void initialize() {
-            TimeEventSourceSetting setting = Preferences.by(TimeEventSourceSetting.class, source.name());
+            TimeEventSourceSetting setting = Preferences.of(TimeEventSourceSetting.class, source.name());
 
             enable.text(source.name()).sync(setting.enable);
             color.disableWhen(enable.isNotSelected()).sync(setting.color, FXUtils::color, FXUtils::color);
diff --git a/src/main/java/viewtify/ui/calendar/TimeEventSourceSetting.java b/src/main/java/viewtify/ui/calendar/TimeEventSourceSetting.java
index c9d884c5d..799049921 100644
--- a/src/main/java/viewtify/ui/calendar/TimeEventSourceSetting.java
+++ b/src/main/java/viewtify/ui/calendar/TimeEventSourceSetting.java
@@ -9,12 +9,12 @@
  */
 package viewtify.ui.calendar;
 
-import viewtify.model.NamedPreferences;
+import viewtify.model.Preferences;
 
 /**
  * Preference for calendar.
  */
-public class TimeEventSourceSetting extends NamedPreferences {
+public class TimeEventSourceSetting extends Preferences {
 
     /** The availability. */
     public final Preference<Boolean> enable = initialize(true);
diff --git a/src/main/java/viewtify/ui/view/PreferenceView.java b/src/main/java/viewtify/ui/view/PreferenceView.java
index f4a303c82..84daf0294 100644
--- a/src/main/java/viewtify/ui/view/PreferenceView.java
+++ b/src/main/java/viewtify/ui/view/PreferenceView.java
@@ -86,12 +86,12 @@ protected ViewDSL declareUI() {
      */
     interface style extends StyleDSL {
         Style left = () -> {
-            display.width(200, px);
-            padding.vertical(40, px).horizontal(10, px);
+            display.minWidth(180, px);
+            padding.vertical(40, px).left(10, px);
         };
 
         Style navi = () -> {
-            display.width(180, px);
+            display.minWidth(160, px);
             font.size(14, px).smooth.grayscale();
             padding.vertical(10, px).left(20, px);
             cursor.pointer();