diff --git a/tests/test_explorer.py b/tests/test_explorer.py
index c219e1fd..bef8c3d2 100644
--- a/tests/test_explorer.py
+++ b/tests/test_explorer.py
@@ -190,7 +190,7 @@ def test_open_builder(self):
                 module="iquip.apps.builder",
                 cls="BuilderApp",
                 show=True,
-                pos="right",
+                pos="center",
                 args={
                     "experimentPath": "experimentPath",
                     "experimentClsName": "experimentClsName",