diff --git a/addons/wiki/models.py b/addons/wiki/models.py
index bff16c53d94..724272770e9 100644
--- a/addons/wiki/models.py
+++ b/addons/wiki/models.py
@@ -59,7 +59,7 @@ def validate_page_name(value):
         raise NameEmptyError('Page name cannot be blank.')
     if value.find('/') != -1:
         raise NameInvalidError('Page name cannot contain forward slashes.')
-    if len(value) > 100:
+    if len(value) > 200:
         raise NameMaximumLengthError('Page name cannot be greater than 100 characters.')
     return True
 
@@ -242,7 +242,7 @@ def get_absolute_url(self):
 
 class WikiPageNodeManager(models.Manager):
 
-    def create_for_node(self, node, name, content, auth, parent=None, is_wiki_import=False):
+    def create_for_node(self, node, name, content, auth, parent=None, is_wiki_import=False, add_activity_log=True):
         existing_wiki_page = WikiPage.objects.get_for_node(node, name)
         if existing_wiki_page:
             raise NodeStateError('Wiki Page already exists.')
@@ -255,7 +255,7 @@ def create_for_node(self, node, name, content, auth, parent=None, is_wiki_import
             is_wiki_import=is_wiki_import
         )
         # Creates a WikiVersion object
-        wiki_page.update(auth.user, content, is_wiki_import=is_wiki_import)
+        wiki_page.update(auth.user, content, is_wiki_import=is_wiki_import, add_log=add_activity_log)
         return wiki_page
 
     def get_for_node(self, node, name=None, id=None):
@@ -312,29 +312,31 @@ def save(self, is_wiki_import=False, *args, **kwargs):
                 self.node.update_search(wiki_page=self)
         return rv
 
-    def update(self, user, content, is_wiki_import=False):
+    def update(self, user, content, is_wiki_import=False, add_log=True):
         """
         Updates the wiki with the provided content by creating a new version
 
         :param user: The user that is updating the wiki
         :param content: Latest content for wiki
+        :param add_log: Whether to add WIKI_UPDATED to the activity log (default True)
         """
         version = WikiVersion(user=user, wiki_page=self, content=content, identifier=self.current_version_number + 1)
         version.save(is_wiki_import=is_wiki_import)
 
-        self.node.add_log(
-            action=NodeLog.WIKI_UPDATED,
-            params={
-                'project': self.node.parent_id,
-                'node': self.node._primary_key,
-                'page': self.page_name,
-                'page_id': self._primary_key,
-                'version': version.identifier,
-            },
-            auth=Auth(user),
-            log_date=version.created,
-            save=True
-        )
+        if add_log:
+            self.node.add_log(
+                action=NodeLog.WIKI_UPDATED,
+                params={
+                    'project': self.node.parent_id,
+                    'node': self.node._primary_key,
+                    'page': self.page_name,
+                    'page_id': self._primary_key,
+                    'version': version.identifier,
+                },
+                auth=Auth(user),
+                log_date=version.created,
+                save=True
+            )
         return version
 
     def update_active_sharejs(self, node):
diff --git a/addons/wiki/templates/import_wiki_page.mako b/addons/wiki/templates/import_wiki_page.mako
index 9e5dfb5745d..ebeb853284a 100644
--- a/addons/wiki/templates/import_wiki_page.mako
+++ b/addons/wiki/templates/import_wiki_page.mako
@@ -1,3 +1,4 @@
+## -*- coding: utf-8 -*-
 <%def name="stylesheets()">
     ${parent.stylesheets()}
     <link rel="stylesheet" href="/static/css/pages/wiki-page.css">
@@ -115,6 +116,15 @@
         const WIKI_IMPORT_TIMEOUT = WIKI_IMPORT_INTERVAL * IMPORT_N;
         const WIKI_IMPORT_OPERATION = 'import';
         const VALIDATE_WIKI_IMPORT_OPERATION = 'validate';
+        const MAX_DISPLAY_NAME_LENGTH = 60; // Maximum number of characters to display
+
+        // Function to truncate file name for display
+        function truncateFileName(fileName, maxLength) {
+            if (!fileName || fileName.length <= maxLength) {
+                return fileName;
+            }
+            return fileName.substring(0, maxLength) + '...';
+        }
 
         $wikiImportForm.on('submit', async function (e) {
             e.preventDefault();
@@ -295,11 +305,15 @@
                     if (item.status === 'valid_exists') {
                         valid_exists_ctn++;
                         $alertInfoForm.find('.partOperationAll').css('display', '');
-                        $('#validateInfo ul').append('<li>' + (item.path).slice(1) + '</li>')
-                        $('#perFileDifinitionForm ul').append('<li id="' + (item.path).slice(1) + '" name="WikiImportOperationPerItem">' + '<div name="WikiImportOperationPerName">' +  (item.path).slice(1) + '</div>' + selectOperation + '</li>');
+                        var displayPath = (item.path).slice(1);
+                        var truncatedPath = truncateFileName(displayPath, MAX_DISPLAY_NAME_LENGTH);
+                        $('#validateInfo ul').append('<li title="' + displayPath + '">' + truncatedPath + '</li>')
+                        $('#perFileDifinitionForm ul').append('<li id="' + (item.path).slice(1) + '" name="WikiImportOperationPerItem">' + '<div name="WikiImportOperationPerName" title="' + displayPath + '">' + truncatedPath + '</div>' + selectOperation + '</li>');
                     } else if (item.status === 'valid_duplicated'){
                         $('#attentionDuplicatedInfo').css('display', '');
-                        $('#duplicatedInfo ul').append('<li>' + (item.path).slice(1) + '</li>')
+                        var displayPath = (item.path).slice(1);
+                        var truncatedPath = truncateFileName(displayPath, MAX_DISPLAY_NAME_LENGTH);
+                        $('#duplicatedInfo ul').append('<li title="' + displayPath + '">' + truncatedPath + '</li>')
                     }
                 });
                 if (valid_exists_ctn === 0) {
diff --git a/addons/wiki/templates/sort_wiki_page.mako b/addons/wiki/templates/sort_wiki_page.mako
index a113b566b75..fcc07d69a9c 100644
--- a/addons/wiki/templates/sort_wiki_page.mako
+++ b/addons/wiki/templates/sort_wiki_page.mako
@@ -14,7 +14,7 @@
                 <div class="modal-body sort-modal-body">
                     <h3 class="sort-title">${_("Wiki Tree")}</h3>
                     <div id="manageWikitree" class="scripted">
-                        <ul class="sort-tree" data-bind="sortable: {template: 'wikitreeRow', data: $root.data, afterMove: $root.afterMove, beforeMove: $root.beforeMove}"></ul>
+                        <ul class="sort-tree" data-bind="sortable: {template: 'wikitreeRow', data: $root.data, afterMove: $root.afterMove, beforeMove: $root.beforeMove, options: { dropOnEmpty: true } }"></ul>
                     </div>
                 </div><!-- end modal-body -->
                 <div class="modal-footer sort-modal-footer">
@@ -41,7 +41,7 @@
     </div>
     <!-- /ko -->
     <!-- ko if: $data.children() -->
-    <ul class="sort-children" data-bind="sortable: { template: 'wikitreeRow', data: $data.children, afterMove: $root.afterMove, beforeMove: $root.beforeMove}"></ul>
+    <ul class="sort-children" data-bind="sortable: { template: 'wikitreeRow', data: $data.children, afterMove: $root.afterMove, beforeMove: $root.beforeMove, options: { dropOnEmpty: true }}"></ul>
     <!-- /ko -->
   </li>
 </script>
\ No newline at end of file
diff --git a/addons/wiki/tests/test_models.py b/addons/wiki/tests/test_models.py
index 33e64c536ab..f94093b2fb6 100644
--- a/addons/wiki/tests/test_models.py
+++ b/addons/wiki/tests/test_models.py
@@ -15,7 +15,7 @@ class TestWikiPageModel:
 
     @pytest.mark.enable_implicit_clean
     def test_page_name_cannot_be_greater_than_100_characters(self):
-        bad_name = 'a' * 101
+        bad_name = 'a' * 201
         page = WikiPage(page_name=bad_name)
         with pytest.raises(NameMaximumLengthError):
             page.save()
diff --git a/addons/wiki/tests/test_views.py b/addons/wiki/tests/test_views.py
index eade053cf89..7fa9b335c4b 100644
--- a/addons/wiki/tests/test_views.py
+++ b/addons/wiki/tests/test_views.py
@@ -222,7 +222,7 @@ def test_rename_new_name_invalid_special_characters(self):
             self.second_wiki.rename(invalid_name, self.auth)
 
     def test_rename_name_maximum_length(self):
-        new_name = 'a' * 101
+        new_name = 'a' * 201
         with pytest.raises(NameMaximumLengthError):
             self.second_wiki.rename(new_name, self.auth)
 
diff --git a/addons/wiki/tests/test_wiki_import.py b/addons/wiki/tests/test_wiki_import.py
index 01744d96f4f..d8e55d1dc17 100644
--- a/addons/wiki/tests/test_wiki_import.py
+++ b/addons/wiki/tests/test_wiki_import.py
@@ -124,7 +124,7 @@ def test_create_for_node_true(self, mock_create):
 
         # True?
         mock_create.assert_called_with(is_wiki_import=True, node=self.project, page_name='home child', parent=None, user=self.user)
-        wiki_page.update.assert_called_with(self.user, 'home child content', is_wiki_import=True)
+        wiki_page.update.assert_called_with(self.user, 'home child content', add_log=True, is_wiki_import=True)
 
     @mock.patch('addons.wiki.models.WikiPage.objects.create')
     def test_create_for_node_false(self, mock_create):
@@ -142,7 +142,7 @@ def test_create_for_node_false(self, mock_create):
 
         # False
         mock_create.assert_called_with(is_wiki_import=False, node=self.project, page_name='home child', parent=None, user=self.user)
-        wiki_page.update.assert_called_with(self.user, 'home child content', is_wiki_import=False)
+        wiki_page.update.assert_called_with(self.user, 'home child content', add_log=True, is_wiki_import=False)
 
     def test_create(self):
         new_node = WikiPage.objects.create(
diff --git a/addons/wiki/views.py b/addons/wiki/views.py
index 2e38ccd7f35..9e680f5d78d 100644
--- a/addons/wiki/views.py
+++ b/addons/wiki/views.py
@@ -31,6 +31,7 @@
 from django.core.exceptions import ObjectDoesNotExist
 from django.utils import timezone
 from framework.exceptions import HTTPError
+from framework.auth import Auth
 from framework.auth.utils import privacy_info_handle
 from framework.auth.decorators import must_be_logged_in
 from framework.auth.core import get_current_user_id
@@ -618,6 +619,11 @@ def format_project_wiki_pages(node, auth):
     pages = []
     can_edit = node.has_permission(auth.user, WRITE) and not node.is_registration
     project_wiki_pages = _get_wiki_pages_latest(node)
+    # ホームが存在せず、編集可能な場合は自動作成（Reorder Wiki Tree で表示するため）
+    # add_activity_log=False: Wikiタブを開いただけの自動作成ではアクティビティログに残さない
+    if (can_edit and auth.user and
+            not WikiPage.objects.get_for_node(node, 'home')):
+        WikiPage.objects.create_for_node(node, 'home', '', Auth(auth.user), add_activity_log=False)
     home_wiki_page = format_home_wiki_page(node)
     pages.append(home_wiki_page)
     for wiki_page in project_wiki_pages:
diff --git a/website/static/css/pages/wiki-page.css b/website/static/css/pages/wiki-page.css
index 6928bdc8d83..ee4a23caf37 100644
--- a/website/static/css/pages/wiki-page.css
+++ b/website/static/css/pages/wiki-page.css
@@ -532,4 +532,152 @@ li[name="WikiImportOperationPerItem"] {
 .milkdown td {
   border: 1px solid #ccc;
   padding: 8px;
+}
+
+/* Hide collaborativeStatus and cp-sidebar-content by default */
+.cp-sidebar-content {
+    display: none !important;
+    visibility: hidden !important;
+    height: 0 !important;
+    overflow: hidden !important;
+}
+
+/* Ensure icons are visible in wiki tree */
+.tb-expand-icon-holder,
+.tb-expand-icon-holder > i,
+.tb-expand-icon-holder > span {
+    display: inline-block !important;
+    visibility: visible !important;
+    opacity: 1 !important;
+}
+
+/* Fix icon and file name alignment in wiki tree */
+#grid .tb-expand-icon-holder,
+#grid .tb-expand-icon-holder > i,
+#grid .tb-expand-icon-holder > span,
+#grid .tb-row .tb-td .fg-file-links {
+    vertical-align: middle !important;
+}
+
+/* Fix icon vertical position (method 3: nudge icon up to align with text) */
+#grid .tb-expand-icon-holder > i,
+#grid .tb-expand-icon-holder > span {
+    position: relative !important;
+    top: -2px !important;
+}
+
+/* Fix long file names in wiki tree - truncate with ellipsis */
+.tb-row .tb-td {
+    overflow: visible !important;
+}
+
+.tb-row .tb-td .fg-file-links {
+    overflow: hidden !important;
+    text-overflow: ellipsis !important;
+    white-space: nowrap !important;
+    display: inline-block !important;
+    max-width: calc(100% - 30px) !important;
+}
+
+/* Fix long file names in wiki import modal - truncate with ellipsis */
+#alertInfo #validateInfo ul,
+#alertInfo #duplicatedInfo ul,
+#alertInfo #duplicatedFolder ul {
+    padding-left: 20px !important;
+    margin: 0 !important;
+    list-style: none !important;
+}
+
+#alertInfo #validateInfo ul li,
+#alertInfo #duplicatedInfo ul li,
+#alertInfo #duplicatedFolder ul li {
+    overflow: hidden !important;
+    text-overflow: ellipsis !important;
+    display: -webkit-box !important;
+    -webkit-line-clamp: 2 !important;
+    -webkit-box-orient: vertical !important;
+    max-width: 100% !important;
+    position: relative !important;
+    padding-left: 15px !important;
+    margin-left: 0 !important;
+    cursor: help !important;
+    word-wrap: break-word !important;
+    word-break: break-word !important;
+    line-height: 1.5 !important;
+    height: auto !important;
+    max-height: none !important;
+}
+
+#alertInfo #validateInfo ul li::before,
+#alertInfo #duplicatedInfo ul li::before,
+#alertInfo #duplicatedFolder ul li::before {
+    content: "・" !important;
+    position: absolute !important;
+    left: 0 !important;
+    display: inline-block !important;
+    width: 15px !important;
+}
+
+#alertInfo #perFileDifinitionForm ul {
+    padding-left: 0 !important;
+    margin: 0 !important;
+}
+
+#alertInfo #perFileDifinitionForm ul li {
+    display: flex !important;
+    align-items: flex-start !important;
+    justify-content: space-between !important;
+    overflow: visible !important;
+    width: 100% !important;
+    box-sizing: border-box !important;
+    padding: 8px 0 !important;
+    margin: 0 !important;
+    list-style: none !important;
+    position: relative !important;
+    padding-left: 0 !important;
+}
+
+#alertInfo #perFileDifinitionForm ul li::before {
+    content: "・" !important;
+    position: absolute !important;
+    left: 5px !important;
+    top: 8px !important;
+    display: inline-block !important;
+    width: auto !important;
+    line-height: 1.5 !important;
+    margin-right: 0 !important;
+}
+
+#alertInfo #perFileDifinitionForm ul li div[name="WikiImportOperationPerName"] {
+    overflow: hidden !important;
+    text-overflow: ellipsis !important;
+    display: -webkit-box !important;
+    -webkit-line-clamp: 2 !important;
+    -webkit-box-orient: vertical !important;
+    flex: 1 1 auto !important;
+    min-width: 0 !important;
+    max-width: calc(100% - 160px) !important;
+    margin-right: 30px !important;
+    margin-left: -30px !important;
+    cursor: help !important;
+    word-wrap: break-word !important;
+    word-break: break-word !important;
+    line-height: 1.5 !important;
+    align-self: flex-start !important;
+}
+
+#alertInfo #perFileDifinitionForm ul li div[name="WikiImportOperationPer"] {
+    flex: 0 0 auto !important;
+    min-width: 120px !important;
+    max-width: 130px !important;
+    width: 130px !important;
+    margin-left: auto !important;
+    align-self: center !important;
+    margin-top: 0 !important;
+}
+
+#alertInfo #perFileDifinitionForm ul li div[name="WikiImportOperationPer"] .form-control {
+    width: 100% !important;
+    min-width: 120px !important;
+    max-width: 130px !important;
 }
\ No newline at end of file