diff --git a/application/forms/ContactGroupForm.php b/application/forms/ContactGroupForm.php
index d7d63ed8..6690529e 100644
--- a/application/forms/ContactGroupForm.php
+++ b/application/forms/ContactGroupForm.php
@@ -53,6 +53,7 @@ protected function assemble(): void
             ]
         ))
             ->setVerticalTermDirection()
+            ->setReadOnly()
             ->setSuggestionUrl(
                 Links::contactGroupsSuggestMember()->with(['showCompact' => true, '_disableLayout' => 1])
             )