DOCS-3814: Expand left sidenav one level down by default to improve navigation and discoverability

config.toml

@@ -117,6 +117,7 @@ navbar_logo = true
 navbar_translucent_over_cover_disable = false
 sidebar_menu_compact = true  # When true, the section headings work like an accordian.
 sidebar_search_disable = true
+ul_show = 3  # Always expand every first level section of the sidenav -- due to tabs, our 'first level' is 3
 
 [params.ui.feedback]
 enable = true

layouts/partials/sidebar-tree.html

@@ -94,7 +94,7 @@
       {{- if (or $hideChildren $treeRoot) -}}
       {{- else -}}
           <span class="menu-toggle">
-          {{ if (or $activePath $active) }}
+          {{ if (or $activePath $active (eq $ulNr 2)) }}
             <i class="fas fa-chevron-down"></i>
           {{ else }}
             <i class="fas fa-chevron-right"></i>