diff --git a/src/applications/project/profilepanel/PhabricatorProjectSubprojectsProfilePanel.php b/src/applications/project/profilepanel/PhabricatorProjectSubprojectsProfilePanel.php
--- a/src/applications/project/profilepanel/PhabricatorProjectSubprojectsProfilePanel.php
+++ b/src/applications/project/profilepanel/PhabricatorProjectSubprojectsProfilePanel.php
@@ -13,6 +13,14 @@
     return pht('Subprojects');
   }
 
+  public function shouldEnableForObject($object) {
+    if ($object->isMilestone()) {
+      return false;
+    }
+
+    return true;
+  }
+
   public function getDisplayName(
     PhabricatorProfilePanelConfiguration $config) {
     $name = $config->getPanelProperty('name');
diff --git a/src/applications/search/engine/PhabricatorProfilePanelEngine.php b/src/applications/search/engine/PhabricatorProfilePanelEngine.php
--- a/src/applications/search/engine/PhabricatorProfilePanelEngine.php
+++ b/src/applications/search/engine/PhabricatorProfilePanelEngine.php
@@ -239,6 +239,10 @@
     // Merge the stored panels into the builtin panels. If a builtin panel has
     // a stored version, replace the defaults with the stored changes.
     foreach ($stored_panels as $stored_panel) {
+      if (!$stored_panel->shouldEnableForObject($object)) {
+        continue;
+      }
+
       $builtin_key = $stored_panel->getBuiltinKey();
       if ($builtin_key !== null) {
         // If this builtin actually exists, replace the builtin with the
@@ -341,6 +345,10 @@
         ->attachProfileObject($object)
         ->setPanelOrder($order);
 
+      if (!$builtin->shouldEnableForObject($object)) {
+        continue;
+      }
+
       $map[$builtin_key] = $builtin;
 
       $order++;
diff --git a/src/applications/search/profilepanel/PhabricatorProfilePanel.php b/src/applications/search/profilepanel/PhabricatorProfilePanel.php
--- a/src/applications/search/profilepanel/PhabricatorProfilePanel.php
+++ b/src/applications/search/profilepanel/PhabricatorProfilePanel.php
@@ -30,6 +30,10 @@
     return false;
   }
 
+  public function shouldEnableForObject($object) {
+    return true;
+  }
+
   public function canHidePanel(
     PhabricatorProfilePanelConfiguration $config) {
     return true;
diff --git a/src/applications/search/storage/PhabricatorProfilePanelConfiguration.php b/src/applications/search/storage/PhabricatorProfilePanelConfiguration.php
--- a/src/applications/search/storage/PhabricatorProfilePanelConfiguration.php
+++ b/src/applications/search/storage/PhabricatorProfilePanelConfiguration.php
@@ -109,6 +109,10 @@
     return $this->getPanel()->canHidePanel($this);
   }
 
+  public function shouldEnableForObject($object) {
+    return $this->getPanel()->shouldEnableForObject($object);
+  }
+
   public function getSortKey() {
     $order = $this->getPanelOrder();
     if ($order === null) {