diff --git a/code/Model/SiteTree.php b/code/Model/SiteTree.php
index 42b516a931..0cf03c2b96 100755
--- a/code/Model/SiteTree.php
+++ b/code/Model/SiteTree.php
@@ -38,6 +38,7 @@
 use SilverStripe\Forms\ListboxField;
 use SilverStripe\Forms\LiteralField;
 use SilverStripe\Forms\OptionsetField;
+use SilverStripe\Forms\SearchableMultiDropdownField;
 use SilverStripe\Forms\Tab;
 use SilverStripe\Forms\TabSet;
 use SilverStripe\Forms\TextareaField;
@@ -2296,11 +2297,12 @@ public function getSettingsFields()
                         _t(__CLASS__.'.VIEWERGROUPS', "Viewer Groups"),
                         Group::class
                     ),
-                    $viewerMembersField = ListboxField::create(
+                    $viewerMembersField = SearchableMultiDropdownField::create(
                         "ViewerMembers",
                         _t(__CLASS__.'.VIEWERMEMBERS', "Viewer Users"),
-                        $membersMap,
-                    ),
+                        Member::get(),
+                    )
+                        ->setIsLazyLoaded(true),
                     $editorsOptionsField = new OptionsetField(
                         "CanEditType",
                         _t(__CLASS__.'.EDITHEADER', "Who can edit this page?")
@@ -2310,11 +2312,12 @@ public function getSettingsFields()
                         _t(__CLASS__.'.EDITORGROUPS', "Editor Groups"),
                         Group::class
                     ),
-                    $editorMembersField = ListboxField::create(
+                    $editorMembersField = SearchableMultiDropdownField::create(
                         "EditorMembers",
                         _t(__CLASS__.'.EDITORMEMBERS', "Editor Users"),
-                        $membersMap
+                        Member::get()
                     )
+                        ->setIsLazyLoaded(true)
                 )
             )
         );