diff --git a/examples/main.py b/examples/main.py
index 6e2fa80..12f994c 100644
--- a/examples/main.py
+++ b/examples/main.py
@@ -28,7 +28,7 @@ async def test_bulk(bulk_in: BulkIn, model=Depends(get_model)):
     return ret.dict()
 
 
-@admin_app.get("/home", )
+@admin_app.get("/home",)
 async def home():
     return {"html": templates.get_template("home.html").render()}
 
diff --git a/fastapi_admin/factory.py b/fastapi_admin/factory.py
index f95446a..f0792db 100644
--- a/fastapi_admin/factory.py
+++ b/fastapi_admin/factory.py
@@ -100,30 +100,45 @@ class AdminApp(FastAPI):
 
         menus = [
             Menu(name="Home", url="/", icon="fa fa-home"),
-            Menu(name="Content", title=True),
-            *self._build_content_menus(),
-            Menu(name="External", title=True),
+            Menu(name="Content", children=self._build_content_menus()),
             Menu(
-                name="Github",
-                url="https://github.com/long2ice/fastapi-admin",
-                icon="fa fa-github",
-                external=True,
+                name="External",
+                children=[
+                    Menu(
+                        name="Github",
+                        url="https://github.com/long2ice/fastapi-admin",
+                        icon="fa fa-github",
+                        external=True,
+                    ),
+                ],
             ),
         ]
         if permission:
             permission_menus = [
-                Menu(name="Auth", title=True),
                 Menu(
-                    name="User", url="/rest/User", icon="fa fa-user", search_fields=("username",),
+                    name="Auth",
+                    children=[
+                        Menu(
+                            name="User",
+                            url="/rest/User",
+                            icon="fa fa-user",
+                            search_fields=("username",),
+                        ),
+                        Menu(
+                            name="Role",
+                            url="/rest/Role",
+                            icon="fa fa-group",
+                            actions={"delete": False},
+                        ),
+                        Menu(
+                            name="Permission",
+                            url="/rest/Permission",
+                            icon="fa fa-user-plus",
+                            actions={"delete": False},
+                        ),
+                        Menu(name="Logout", url="/logout", icon="fa fa-lock",),
+                    ],
                 ),
-                Menu(name="Role", url="/rest/Role", icon="fa fa-group", actions={"delete": False}),
-                Menu(
-                    name="Permission",
-                    url="/rest/Permission",
-                    icon="fa fa-user-plus",
-                    actions={"delete": False},
-                ),
-                Menu(name="Logout", url="/logout", icon="fa fa-lock",),
             ]
             menus += permission_menus
         return menus
@@ -171,7 +186,7 @@ class AdminApp(FastAPI):
             raise Exception("No Permission Model Founded.")
 
         for model, _ in get_all_models():
-            for action in enums.PermissionAction:
+            for action in enums.PermissionAction.choices():
                 label = f"{enums.PermissionAction.choices().get(action)} {model}"
                 defaults = dict(label=label, model=model, action=action,)
                 await permission_model.get_or_create(**defaults,)
diff --git a/fastapi_admin/site.py b/fastapi_admin/site.py
index b7433a6..b501300 100644
--- a/fastapi_admin/site.py
+++ b/fastapi_admin/site.py
@@ -5,8 +5,6 @@ from pydantic import BaseModel, HttpUrl
 
 class Menu(BaseModel):
     name: str
-    # whether is it a title or a model resource.
-    title: Optional[bool]
     # must be format with /rest/<Model> if it's a model resource.
     url: Optional[str]
     icon: Optional[str]
@@ -27,7 +25,7 @@ class Menu(BaseModel):
     # define field type,like select,radiolist,text,date
     fields_type: Dict = {}
     # define field attr,like cols which in bootstrap table
-    attrs: Dict[str, Dict] = {}
+    attrs: Dict[str, Dict] = {"created_at": {"label": "CreatedAt"}}
     # active table export
     export: bool = True
     actions: Optional[Dict]
@@ -49,7 +47,6 @@ class Site(BaseModel):
     theme_switcher: bool = False
     theme: Optional[str]
     url: Optional[HttpUrl]
-    grid_style: int = 1
     # custom css
     css: Optional[List[HttpUrl]]
     # menu define