diff --git a/src/config_generator/map_viewer_config.py b/src/config_generator/map_viewer_config.py
index 6a5edf1..724d2bf 100644
--- a/src/config_generator/map_viewer_config.py
+++ b/src/config_generator/map_viewer_config.py
@@ -501,6 +501,7 @@ def theme_item(self, cfg_item, themes_config, assets_dir, autogenExternalLayers,
         self.set_optional_config(cfg_item, 'pluginData', item)
         self.set_optional_config(cfg_item, 'snapping', item)
         self.set_optional_config(cfg_item, 'themeInfoLinks', item)
+        self.set_optional_config(cfg_item, 'layerTreeHiddenSublayers', item)
 
         if not cfg_item.get('wmsOnly', False):
             item['thumbnail'] = self.get_thumbnail(cfg_item, service_name, cap, assets_dir)