No shortcuts by default to show/hide all polygons

labelme/config/default_config.yaml

@@ -119,6 +119,6 @@ shortcuts:
   toggle_keep_prev_mode: Ctrl+P
   remove_selected_point: [Meta+H, Backspace]
 
-  show_all_polygons: G
-  hide_all_polygons: H
+  show_all_polygons: null
+  hide_all_polygons: null
   toggle_all_polygons: T