diff -r 9539c5209338 -r f5eca01f0a1d src/pyams_content/shared/site/manager.py
--- a/src/pyams_content/shared/site/manager.py	Wed Jan 27 16:14:21 2021 +0100
+++ b/src/pyams_content/shared/site/manager.py	Mon Feb 01 13:31:22 2021 +0100
@@ -62,6 +62,7 @@
     header = FieldProperty(ISiteManager['header'])
     description = FieldProperty(ISiteManager['description'])
     notepad = FieldProperty(ISiteManager['notepad'])
+    navigation_mode = FieldProperty(ISiteManager['navigation_mode'])
 
     allowed_paragraphs = FieldProperty(IParagraphFactorySettings['allowed_paragraphs'])
     auto_created_paragraphs = FieldProperty(IParagraphFactorySettings['auto_created_paragraphs'])