diff --git a/doc/utils/sphinx-config/conf.py b/doc/utils/sphinx-config/conf.py
index 446eaeedac..cc7dc0741f 100644
--- a/doc/utils/sphinx-config/conf.py
+++ b/doc/utils/sphinx-config/conf.py
@@ -136,7 +136,9 @@ html_theme = 'lammps_theme'
 # further.  For a list of options available for each theme, see the
 # documentation.
 html_theme_options = {
-   'logo_only' : True
+   'logo_only' : True,
+   'navigation_depth': 3,
+   'collapse_navigation': True
 }
 
 # Add any paths that contain custom themes here, relative to this directory.