fixed

src/server/views/layout-growi/base/layout.html

@@ -9,7 +9,7 @@
 {% block layout_main %}
 <div class="container-fluid">
 
-  <div class="row grw-subnav">
+  <div class="row grw-subnav sticky-top">
     <div class="col-12 grw-title-bar">
       {% block content_header %}
       {% endblock %}