diff --git a/doc/_sphinx/conf.py b/doc/_sphinx/conf.py
index a8a9f870b..37f3ce232 100644
--- a/doc/_sphinx/conf.py
+++ b/doc/_sphinx/conf.py
@@ -64,7 +64,7 @@ pygments_style = 'monokai'
 # relative to this directory. They are copied after the builtin static files,
 # so a file named "default.css" will overwrite the builtin "default.css".
 html_static_path = ['images', 'scripts', 'theme']
-html_js_files = ['versions.js', 'menu-expand.js']
+html_js_files = ['versions.js']
 
 # -- Custom setup ------------------------------------------------------------
 class TitleCollector(docutils.nodes.SparseNodeVisitor):
diff --git a/doc/_sphinx/scripts/menu-expand.js b/doc/_sphinx/scripts/menu-expand.js
deleted file mode 100644
index 2eea638fe..000000000
--- a/doc/_sphinx/scripts/menu-expand.js
+++ /dev/null
@@ -1,21 +0,0 @@
-// Auto expand the first expandable node ("flame") when loaded.
-window.addEventListener('load', (_event) => {
-    expandFirstOnHome();
-});
-
-/**
- * This method expands the first expandable node on the home page.
- * 
- * If the current page is not the home page, this method does nothing.
- */
-// When the path name ends with index.html or an empty string, it is home page.
-function expandFirstOnHome() {
-    const parts = location.pathname.split('/');
-    const lastPart = parts[parts.length - 1];
-    const isHomePage = (lastPart == '') || (lastPart == 'index.html');
-
-    if (isHomePage) {
-        // expand the first expandable node in the toctree
-        $('li.toctree-l1').has('ul').first().addClass('current');
-    }
-}