diff --git a/flutter/lib/desktop/pages/desktop_setting_page.dart b/flutter/lib/desktop/pages/desktop_setting_page.dart
index a8ed3f082..c0a2f4762 100644
--- a/flutter/lib/desktop/pages/desktop_setting_page.dart
+++ b/flutter/lib/desktop/pages/desktop_setting_page.dart
@@ -1220,7 +1220,7 @@ class _SafetyState extends State<_Safety> with AutomaticKeepAliveClientMixin {
                 width: 95,
                 child: TextField(
                   controller: controller,
-                  enabled: enabled && !locked && isOptFixed,
+                  enabled: enabled && !locked && !isOptFixed,
                   onChanged: (_) => applyEnabled.value = true,
                   inputFormatters: [
                     FilteringTextInputFormatter.allow(RegExp(