diff -r 43bd56f3a726 -r 48c1ee485dc0 src/pyams_content/shared/view/theme.py
--- a/src/pyams_content/shared/view/theme.py	Fri Nov 13 13:08:48 2020 +0100
+++ b/src/pyams_content/shared/view/theme.py	Fri Nov 13 13:11:29 2020 +0100
@@ -10,8 +10,6 @@
 # FOR A PARTICULAR PURPOSE.
 #
 
-__docformat__ = 'restructuredtext'
-
 from hypatia.interfaces import ICatalog
 from hypatia.query import Any
 from persistent import Persistent
@@ -32,6 +30,9 @@
 from pyams_utils.registry import get_utility, query_utility
 
 
+__docformat__ = 'restructuredtext'
+
+
 #
 # Tags management
 #
@@ -118,6 +119,7 @@
 
     select_context_themes = FieldProperty(IViewThemesSettings['select_context_themes'])
     themes = FieldProperty(IViewThemesSettings['themes'])
+    include_subthemes = FieldProperty(IViewThemesSettings['include_subthemes'])
 
     @property
     def is_using_context(self):
@@ -131,6 +133,9 @@
                 themes |= set(themes_info.themes or ())
         if self.themes:
             themes |= set(self.themes)
+        if self.include_subthemes:
+            for theme in themes.copy():
+                themes |= set(theme.gel_all_childs())
         return themes
 
     def get_themes_index(self, context):