diff --git a/README.md b/README.md
index ffb95c0..24f929d 100644
--- a/README.md
+++ b/README.md
@@ -37,7 +37,7 @@ import panel as pn
 
 from panel_reactflow import ReactFlow
 
-pn.extension()
+pn.extension("jsoneditor")
 
 nodes = [
     {
diff --git a/docs/index.md b/docs/index.md
index a199a9a..7d6c6b3 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -22,11 +22,15 @@ generate forms, and plug in editors where you need full control.
 
 ## Quickstart
 
+!!! tip "JSONEditor Extension Required"
+    ReactFlow requires the `jsoneditor` Panel extension for editing node and edge data.
+    Always call `pn.extension("jsoneditor")` at the start of your application.
+
 ```python
 import panel as pn
 from panel_reactflow import NodeType, ReactFlow
 
-pn.extension()
+pn.extension("jsoneditor")
 
 task_schema = {
     "type": "object",
diff --git a/docs/quickstart.md b/docs/quickstart.md
index 3422b2f..cf1198e 100644
--- a/docs/quickstart.md
+++ b/docs/quickstart.md
@@ -14,6 +14,12 @@ pip install panel-reactflow
 
 ## Minimal app
 
+!!! note "Required Extension"
+    ReactFlow uses Panel's JSONEditor widget for editing node and edge data.
+    You must call `pn.extension("jsoneditor")` before creating ReactFlow instances
+    to ensure the extension loads correctly. This should be done early in your
+    application, typically right after your imports.
+
 ```python
 import panel as pn
 
diff --git a/src/panel_reactflow/schema.py b/src/panel_reactflow/schema.py
index ae0c2aa..1bbb6a2 100644
--- a/src/panel_reactflow/schema.py
+++ b/src/panel_reactflow/schema.py
@@ -1,7 +1,7 @@
 import pandas as pd
 import panel as pn
 import param  # type: ignore
-from panel.layout.base import Panel
+from panel.layout.base import ListLike, Panel
 from panel.pane.base import PaneBase
 from panel.widgets.base import WidgetBase
 from panel_material_ui import (
@@ -27,7 +27,10 @@
 class JSONSchema(PaneBase):
     default_layout = param.ClassSelector(
         default=Paper,
-        class_=(Panel,),
+        class_=(
+            Panel,
+            ListLike,
+        ),
         is_instance=False,
         doc="""
         Defines the layout the model(s) returned by the pane will
diff --git a/tests/ui/test_ui.py b/tests/ui/test_ui.py
index 8e9414e..4f8a636 100644
--- a/tests/ui/test_ui.py
+++ b/tests/ui/test_ui.py
@@ -1,6 +1,7 @@
 """UI tests for ReactFlow using Playwright."""
 
 import panel as pn
+import panel.models.jsoneditor  # noqa
 import pytest
 from panel.tests.util import serve_component, wait_until
 
@@ -10,8 +11,6 @@
 
 from playwright.sync_api import expect
 
-pn.extension()
-
 pytestmark = pytest.mark.ui