diff --git a/datalab/gui/main.py b/datalab/gui/main.py
index fee7dd5e..2541d2fb 100644
--- a/datalab/gui/main.py
+++ b/datalab/gui/main.py
@@ -57,6 +57,8 @@
     APP_NAME,
     DATAPATH,
     DEBUG,
+    PLOTPY_CONF,
+    PLOTPY_DEFAULTS,
     TEST_SEGFAULT_ERROR,
     Conf,
     _,
@@ -2416,6 +2418,7 @@ def __update_color_mode(self, startup: bool = False) -> None:
         self.setUpdatesEnabled(False)
 
         plotpy_config.set_plotpy_color_mode(mode)
+        PLOTPY_CONF.update_defaults(PLOTPY_DEFAULTS)
 
         if self.console is not None:
             self.console.update_color_mode()