Update

app/Http/Controllers/AdminUserController.php

@@ -17,8 +17,11 @@ class AdminUserController extends Controller
 {
     public function index(Request $request)
     {
-        $query = AdminUser::with(['roles'])->filter($request->all())->where('id', '>', 1);
-        $list = $query->paginate(Paginator::resolvePerPage('per_page', 20, 50));
+        $list = AdminUser::with(['roles'])
+            ->filter($request->all())
+            ->where('id', '>', 1)
+            ->when(! $request->user()?->isAdministrator(), fn ($query) => $query->where('id', '!=', 1))
+            ->paginate(Paginator::resolvePerPage('per_page', 20, 50));
 
         return $this->json(AdminUserResource::collection($list));
     }