diff -r ac39aec467ea -r 356a54a98a51 src/pyams_default_theme/shared/site/folder.py
--- a/src/pyams_default_theme/shared/site/folder.py	Mon Feb 01 13:36:23 2021 +0100
+++ b/src/pyams_default_theme/shared/site/folder.py	Mon Feb 01 13:48:27 2021 +0100
@@ -15,7 +15,7 @@
 from pyramid.httpexceptions import HTTPSeeOther
 
 from pyams_content.shared.site import ISiteElementNavigation
-from pyams_content.shared.site.interfaces import FOLDER_REDIRECT_DISPLAY_MODE, ISiteFolder
+from pyams_content.shared.site.interfaces import SITE_CONTAINER_REDIRECT_MODE, ISiteFolder
 from pyams_default_theme.interfaces import IContentSummaryInfo
 from pyams_i18n.interfaces import II18n
 from pyams_pagelet.pagelet import pagelet_config
@@ -65,20 +65,22 @@
     """Site folder index page"""
 
     def __call__(self, **kwargs):
-        if self.context.navigation_mode == FOLDER_REDIRECT_DISPLAY_MODE:
+        if self.context.navigation_mode == SITE_CONTAINER_REDIRECT_MODE:
             target = next(self.context.get_visible_items(self.request), None)
             if target is not None:
                 return HTTPSeeOther(relative_url(target, request=self.request))
-        return super(SiteFolderIndexPage, self).__call__(**kwargs)
+        return super().__call__(**kwargs)
 
 
-@pagelet_config(name='preview.html', context=ISiteFolder, layer=IPyAMSUserLayer, permission=VIEW_SYSTEM_PERMISSION)
+@pagelet_config(name='preview.html', context=ISiteFolder, layer=IPyAMSUserLayer,
+                permission=VIEW_SYSTEM_PERMISSION)
 class SiteFolderPreviewPage(PortalContextPreviewPage):
     """Site folder preview page"""
 
     def __call__(self, **kwargs):
-        if self.context.navigation_mode == FOLDER_REDIRECT_DISPLAY_MODE:
+        if self.context.navigation_mode == SITE_CONTAINER_REDIRECT_MODE:
             target = next(self.context.get_visible_items(self.request), None)
             if target is not None:
-                return HTTPSeeOther(relative_url(target, request=self.request, view_name='preview.html'))
-        return super(SiteFolderPreviewPage, self).__call__(**kwargs)
+                return HTTPSeeOther(relative_url(target, request=self.request,
+                                                 view_name='preview.html'))
+        return super().__call__(**kwargs)