diff --git a/demo-project/src/demo_project/pipeline_registry.py b/demo-project/src/demo_project/pipeline_registry.py
index 78cbc5f217..1c2dd58df3 100644
--- a/demo-project/src/demo_project/pipeline_registry.py
+++ b/demo-project/src/demo_project/pipeline_registry.py
@@ -8,36 +8,6 @@
 from demo_project.pipelines import modelling as mod
 from demo_project.pipelines import reporting as rep
 
-def create_pipeline(**kwargs) -> Pipeline:
-    data_processing_pipeline = pipeline(
-        [
-            node(
-                lambda x: x,
-                inputs=["raw_data"],
-                outputs="model_inputs",
-                name="process_data",
-                tags=["split"],
-            )
-        ],
-        namespace="uk.something1.data_processing",
-        outputs="model_inputs",
-    )
-    data_science_pipeline = pipeline(
-        [
-            node(
-                lambda x: x,
-                inputs=["model_inputs"],
-                outputs="model",
-                name="train_model",
-                tags=["train"],
-            )
-        ],
-        namespace="uk.something2.data_science",
-        inputs="model_inputs",
-    )
-    return data_processing_pipeline + data_science_pipeline
-
-
 def register_pipelines() -> Dict[str, Pipeline]:
     """Register the project's pipelines.
 
@@ -58,16 +28,15 @@ def register_pipelines() -> Dict[str, Pipeline]:
     
 
     return {
-        "__default__": create_pipeline(),
-        # "__default__": (
-        #     ingestion_pipeline
-        #     + feature_pipeline
-        #     + modelling_pipeline
-        #     + reporting_pipeline
-        # ),
-        # "Data ingestion": ingestion_pipeline,
-        # "Modelling stage": modelling_pipeline,
-        # "Feature engineering": feature_pipeline,
-        # "Reporting stage": reporting_pipeline,
-        # "Pre-modelling": ingestion_pipeline + feature_pipeline,
+        "__default__": (
+            ingestion_pipeline
+            + feature_pipeline
+            + modelling_pipeline
+            + reporting_pipeline
+        ),
+        "Data ingestion": ingestion_pipeline,
+        "Modelling stage": modelling_pipeline,
+        "Feature engineering": feature_pipeline,
+        "Reporting stage": reporting_pipeline,
+        "Pre-modelling": ingestion_pipeline + feature_pipeline,
     }
diff --git a/package/kedro_viz/data_access/repositories/modular_pipelines.py b/package/kedro_viz/data_access/repositories/modular_pipelines.py
index a1bb7361a7..a3cb43b0df 100644
--- a/package/kedro_viz/data_access/repositories/modular_pipelines.py
+++ b/package/kedro_viz/data_access/repositories/modular_pipelines.py
@@ -168,12 +168,12 @@ def add_children(self, modular_pipeline_id: str, task_nodes: List[GraphNode]):
             modular_pipeline.outputs
         )
 
+  # The line `parent_modular_pipeline_id = ('.'.join(modular_pipeline_id.split('.')[:-1]) if '.' in
+  # modular_pipeline_id else None)` is extracting the parent modular pipeline ID from the given
+  # modular pipeline ID.
         parent_modular_pipeline_id = (
         '.'.join(modular_pipeline_id.split('.')[:-1]) if '.' in modular_pipeline_id else None
 )
-
-        print("Modular Pipeline ID", modular_pipeline_id)
-        print("Parent Modular Pipeline ID", parent_modular_pipeline_id)
         if parent_modular_pipeline_id:
             parent_modular_pipeline = self.get_or_create_modular_pipeline(
                 parent_modular_pipeline_id