diff --git a/src/woodshop/gui/main_window.py b/src/woodshop/gui/main_window.py
index dbceadd..bf579fd 100644
--- a/src/woodshop/gui/main_window.py
+++ b/src/woodshop/gui/main_window.py
@@ -126,6 +126,8 @@ class MainWindow(QMainWindow):
     def _on_changed(self):
         scene = self.controller.scene
         self.viewport.render_scene(scene, self.controller.selected)
+        # render_scene clears all actors — re-apply the feature overlay on top.
+        self.viewport.set_preview(self.controller.preview, self.controller.preview_kind)
         bf = sum(board_feet(p.stock, p.length_in) for p in scene.parts)
         sel = self.controller.selected
         sel_txt = (f"{len(sel)} selected" if len(sel) > 1