diff --git a/cspell.config.yaml b/cspell.config.yaml
index c559e228..7a23ee4a 100644
--- a/cspell.config.yaml
+++ b/cspell.config.yaml
@@ -49,6 +49,7 @@ words:
   - Typecheck
   - uncategorized
   - unflatten
+  - unproxify
   - weba
   - webformat
   - xslx
diff --git a/src/lib/components/contents/details/widgets/list/list-editor.svelte b/src/lib/components/contents/details/widgets/list/list-editor.svelte
index aac9042e..df2f8d67 100644
--- a/src/lib/components/contents/details/widgets/list/list-editor.svelte
+++ b/src/lib/components/contents/details/widgets/list/list-editor.svelte
@@ -66,12 +66,14 @@
   let mounted = false;
   let widgetId = '';
   let inputValue = '';
-  let itemExpandedList = [];
 
   onMount(() => {
     mounted = true;
     widgetId = generateUUID().split('-').pop();
-    itemExpandedList = items.map(() => !collapsed);
+
+    items.forEach((__, index) => {
+      $entryDraft.viewStates[locale][`${keyPath}.${index}.expanded`] = !collapsed;
+    });
   });
 
   /**
@@ -116,8 +118,7 @@
 
   /**
    * Update the value for the List widget with subfield(s).
-   * @param {(list: any[]) => void} manipulate A function to manipulate the list, which takes one
-   * argument of the list itself. The typical usage is `list.splice()`.
+   * @param {({ valueList, viewList }) => void} manipulate See {@link updateListField}.
    */
   const updateComplexList = (manipulate) => {
     Object.keys($entryDraft.currentValues).forEach((_locale) => {
@@ -133,7 +134,7 @@
    * @see https://decapcms.org/docs/beta-features/#list-widget-variable-types
    */
   const addItem = (subFieldName) => {
-    updateComplexList((list) => {
+    updateComplexList(({ valueList, viewList }) => {
       const newItem = {};
 
       const subFields = subFieldName
@@ -153,10 +154,10 @@
         newItem[typeKey] = subFieldName;
       }
 
-      const index = addToTop ? 0 : list.length;
+      const index = addToTop ? 0 : valueList.length;
 
-      list.splice(index, 0, newItem);
-      itemExpandedList.splice(index, 0, true);
+      valueList.splice(index, 0, newItem);
+      viewList.splice(index, 0, { expanded: true });
     });
   };
 
@@ -165,9 +166,9 @@
    * @param {number} index Target index.
    */
   const deleteItem = (index) => {
-    updateComplexList((list) => {
-      list.splice(index, 1);
-      itemExpandedList.splice(index, 1);
+    updateComplexList(({ valueList, viewList }) => {
+      valueList.splice(index, 1);
+      viewList.splice(index, 1);
     });
   };
 
@@ -176,12 +177,9 @@
    * @param {number} index Target index.
    */
   const moveUpItem = (index) => {
-    updateComplexList((list) => {
-      [list[index], list[index - 1]] = [list[index - 1], list[index]];
-      [itemExpandedList[index], itemExpandedList[index - 1]] = [
-        itemExpandedList[index - 1],
-        itemExpandedList[index],
-      ];
+    updateComplexList(({ valueList, viewList }) => {
+      [valueList[index], valueList[index - 1]] = [valueList[index - 1], valueList[index]];
+      [viewList[index], viewList[index - 1]] = [viewList[index - 1], viewList[index]];
     });
   };
 
@@ -190,12 +188,9 @@
    * @param {number} index Target index.
    */
   const moveDownItem = (index) => {
-    updateComplexList((list) => {
-      [list[index], list[index + 1]] = [list[index + 1], list[index]];
-      [itemExpandedList[index], itemExpandedList[index + 1]] = [
-        itemExpandedList[index + 1],
-        itemExpandedList[index],
-      ];
+    updateComplexList(({ valueList, viewList }) => {
+      [valueList[index], valueList[index + 1]] = [valueList[index + 1], valueList[index]];
+      [viewList[index], viewList[index + 1]] = [viewList[index + 1], viewList[index]];
     });
   };
 
@@ -234,21 +229,22 @@
     </div>
     <div class="item-list" id="list-{widgetId}-item-list" class:collapsed={!parentExpanded}>
       {#each items as item, index}
+        {@const expanded = !!$entryDraft.viewStates[locale][`${keyPath}.${index}.expanded`]}
         <!-- @todo Support drag sorting. -->
         <div class="item">
           <div class="header">
             <div>
               <Button
-                aria-expanded={itemExpandedList[index]}
+                aria-expanded={expanded}
                 aria-controls="list-{widgetId}-item-{index}-body"
                 on:click={() => {
-                  itemExpandedList[index] = !itemExpandedList[index];
+                  $entryDraft.viewStates[locale][`${keyPath}.${index}.expanded`] = !expanded;
                 }}
               >
                 <Icon
                   slot="start-icon"
-                  name={itemExpandedList[index] ? 'expand_more' : 'chevron_right'}
-                  label={itemExpandedList[index] ? $_('collapse') : $_('expand')}
+                  name={expanded ? 'expand_more' : 'chevron_right'}
+                  label={expanded ? $_('collapse') : $_('expand')}
                 />
                 {#if types}
                   <span class="type">
@@ -287,7 +283,7 @@
             </div>
           </div>
           <div class="item-body" id="list-{widgetId}-item-{index}-body">
-            {#if itemExpandedList[index]}
+            {#if expanded}
               {@const subFieldName = Array.isArray(types)
                 ? $entryDraft.currentValues[locale][`${keyPath}.${index}.${typeKey}`]
                 : undefined}
diff --git a/src/lib/components/contents/details/widgets/select/select-editor.svelte b/src/lib/components/contents/details/widgets/select/select-editor.svelte
index befda794..b4544b0c 100644
--- a/src/lib/components/contents/details/widgets/select/select-editor.svelte
+++ b/src/lib/components/contents/details/widgets/select/select-editor.svelte
@@ -43,8 +43,7 @@
 
   /**
    * Update the value for the list.
-   * @param {(list: any[]) => void} manipulate A function to manipulate the list, which takes one
-   * argument of the list itself. The typical usage is `list.splice()`.
+   * @param {({ valueList, viewList }) => void} manipulate See {@link updateListField}.
    */
   const updateList = (manipulate) => {
     Object.keys($entryDraft.currentValues).forEach((_locale) => {
@@ -59,8 +58,8 @@
    * @param {string} value New value.
    */
   const addValue = (value) => {
-    updateList((list) => {
-      list.push(value);
+    updateList(({ valueList }) => {
+      valueList.push(value);
     });
   };
 
@@ -69,8 +68,8 @@
    * @param {number} index Target index.
    */
   const removeValue = (index) => {
-    updateList((list) => {
-      list.splice(index, 1);
+    updateList(({ valueList }) => {
+      valueList.splice(index, 1);
     });
   };
 </script>
diff --git a/src/lib/services/contents/editor.js b/src/lib/services/contents/editor.js
index d1aa72ba..9c3cc5a5 100644
--- a/src/lib/services/contents/editor.js
+++ b/src/lib/services/contents/editor.js
@@ -265,30 +265,49 @@ export const createDraft = (entry, defaultValues) => {
       ]),
     ),
     validities: Object.fromEntries(allLocales.map((locale) => [locale, {}])),
+    viewStates: Object.fromEntries(allLocales.map((locale) => [locale, {}])),
   });
 };
 
 /**
- * Update the value in a list field.
- * @param {LocaleCode} locale Target locale.
- * @param {string} keyPath Dot-connected field name.
- * @param {(list: any[]) => void} manipulate A function to manipulate the list, which takes one
- * argument of the list itself. The typical usage is `list.splice()`.
+ * Unproxify & unflatten the given object.
+ * @param {Proxy | object} obj Original proxy or object.
+ * @returns {object} Processed object.
  */
-export const updateListField = (locale, keyPath, manipulate) => {
-  const unflattenObj = unflatten(get(entryDraft).currentValues[locale]);
+const unflattenObj = (obj) => unflatten(JSON.parse(JSON.stringify(obj)));
 
-  // Traverse the object by decoding dot-connected `keyPath`
-  const list = keyPath.split('.').reduce((obj, key) => {
+/**
+ * Traverse the given object by decoding dot-connected `keyPath`.
+ * @param {object} obj Unflatten object.
+ * @param {string} keyPath Dot-connected field name.
+ * @returns {object[]} Values.
+ */
+const getItemList = (obj, keyPath) =>
+  keyPath.split('.').reduce((_obj, key) => {
     const _key = key.match(/^\d+$/) ? Number(key) : key;
 
     // Create a new array when adding a new item
-    obj[_key] ||= [];
+    _obj[_key] ||= [];
+
+    return _obj[_key];
+  }, obj);
 
-    return obj[_key];
-  }, unflattenObj);
+/**
+ * Update the value in a list field.
+ * @param {LocaleCode} locale Target locale.
+ * @param {string} keyPath Dot-connected field name.
+ * @param {({ valueList, viewList }) => void} manipulate A function to manipulate the list, which
+ * takes one object argument containing the value list and view state list. The typical usage is
+ * `list.splice()`.
+ */
+export const updateListField = (locale, keyPath, manipulate) => {
+  const currentValues = unflattenObj(get(entryDraft).currentValues[locale]);
+  const viewStates = unflattenObj(get(entryDraft).viewStates[locale]);
 
-  manipulate(list);
+  manipulate({
+    valueList: getItemList(currentValues, keyPath),
+    viewList: getItemList(viewStates, keyPath),
+  });
 
   entryDraft.update((draft) => ({
     ...draft,
@@ -299,9 +318,13 @@ export const updateListField = (locale, keyPath, manipulate) => {
         draft,
         prop: 'currentValues',
         locale,
-        target: flatten(unflattenObj),
+        target: flatten(currentValues),
       }),
     },
+    viewStates: {
+      ...draft.viewStates,
+      [locale]: flatten(viewStates),
+    },
   }));
 };
 
diff --git a/src/lib/typedefs.js b/src/lib/typedefs.js
index e70eef3d..65ef2890 100644
--- a/src/lib/typedefs.js
+++ b/src/lib/typedefs.js
@@ -452,6 +452,12 @@
  * @see https://www.npmjs.com/package/flatten
  */
 
+/**
+ * Flattened {@link EntryContent} object, where key is a key path, but value will be a file to be
+ * uploaded.
+ * @typedef {{ [key: string]: File }} FlattenedEntryContentFileList
+ */
+
 /**
  * Flattened {@link EntryContent} object, where key is a key path, but value will be the value’s
  * validity, using the same properties as the native HTML5 constraint validation.
@@ -460,9 +466,9 @@
  */
 
 /**
- * Flattened {@link EntryContent} object, where key is a key path, but value will be a file to be
- * uploaded.
- * @typedef {{ [key: string]: File }} FlattenedEntryContentFileList
+ * Flattened {@link EntryContent} object, where key is a key path, but value will be the value’s
+ * UI state.
+ * @typedef {{ [key: string]: any }} FlattenedEntryContentViewState
  */
 
 /**
@@ -476,13 +482,15 @@
  * @property {CollectionFile} [collectionFile] File details. (File collection only)
  * @property {Entry} [originalEntry] Original entry or `undefined` if it’s a new entry draft.
  * @property {{ [key: LocaleCode]: FlattenedEntryContent }} originalValues Key is a locale code,
- * value is an flattened object containing all the original field values.
+ * value is a flattened object containing all the original field values.
  * @property {{ [key: LocaleCode]: FlattenedEntryContent }} currentValues Key is a locale code,
- * value is an flattened object containing all the current field values while editing.
+ * value is a flattened object containing all the current field values while editing.
  * @property {{ [key: LocaleCode]: FlattenedEntryContentFileList }} files Files to be uploaded.
  * @property {{ [key: LocaleCode]: FlattenedEntryContentValidityState }} validities Key is a locale
- * code, value is an flattened object containing validation results of all the current field values
+ * code, value is a flattened object containing validation results of all the current field values
  * while editing.
+ * @property {{ [key: LocaleCode]: FlattenedEntryContentViewState }} viewStates Key is a locale
+ * code, value is a flattened object containing the UI state.
  */
 
 /**