diff --git a/Documentation/conf.py b/Documentation/conf.py
index c715610d6297..a5c45df0bd83 100644
--- a/Documentation/conf.py
+++ b/Documentation/conf.py
@@ -296,6 +296,10 @@ if html_theme == 'sphinx_rtd_theme' or html_theme == 'sphinx_rtd_dark_mode':
                 # Add color-specific RTD normal mode
                 html_css_files.append('theme_rtd_colors.css')
 
+        html_theme_options = {
+            'navigation_depth': -1,
+        }
+
     except ImportError:
         html_theme = 'alabaster'