diff --git a/website/mkdocs.yml b/website/mkdocs.yml
index 5c2600e..07cc779 100644
--- a/website/mkdocs.yml
+++ b/website/mkdocs.yml
@@ -63,6 +63,7 @@ theme:
   features:
   - instant
   - navigation.sections
+  - navigation.expand
   - navigation.tabs
   - navigation.tabs.sticky
   - navigation.footer