chg: [instance:settings] group and panel level are optionals

templates/Instance/settings.php

@@ -66,6 +66,7 @@ function genContentForNav($sectionSettings, $appView)
         } else {
             $groupedContent[] = '';
         }
+        if (!isLeaf($subSectionSettings)) {
             $groupedSetting[$sectionName] = array_filter( // only show grouped settings
                 array_keys($subSectionSettings),
                 function ($settingGroupName) use ($subSectionSettings) {
@@ -73,6 +74,7 @@ function genContentForNav($sectionSettings, $appView)
                 }
             );
         }
+    }
     $contentHtml = implode('', $groupedContent);
     $scrollspyNav = $appView->element('Settings/scrollspyNav', [
         'groupedSetting' => $groupedSetting
@@ -89,6 +91,14 @@ function genSection($sectionName, $subSectionSettings, $appView)
 {
     $sectionContent = [];
     $sectionContent[] = sprintf('<div id="%s">', sprintf('sp-%s', h($sectionName)));
+    if (isLeaf($subSectionSettings)) {
+        $panelHTML = $appView->element('Settings/panel', [
+            'sectionName' => $sectionName,
+            'panelName' => $sectionName,
+            'panelSettings' => $subSectionSettings,
+        ]);
+        $sectionContent[] = $panelHTML;
+    } else {
         foreach ($subSectionSettings as $panelName => $panelSettings) {
             if (!empty($panelSettings)) {
                 $panelHTML = $appView->element('Settings/panel', [
@@ -101,6 +111,7 @@ function genSection($sectionName, $subSectionSettings, $appView)
                 $sectionContent[] = '';
             }
         }
+    }
     $sectionContent[] = '</div>';
     return implode('', $sectionContent);
 }