diff --git a/docs/conf.rst b/docs/conf.rst
new file mode 100644
index 0000000..e873371
--- /dev/null
+++ b/docs/conf.rst
@@ -0,0 +1,12 @@
+=============
+Configuration
+=============
+
+The extension provides the following configuration:
+
+.. autoconfval:: project_example_style
+
+   Controls the default value of the :rst:dir:`example` directive's
+   ``:style:`` option.
+
+   Supported values are ``grid`` and ``tab``. The default is ``grid``.
diff --git a/docs/index.rst b/docs/index.rst
index 9503e0f..bddcc5c 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -75,6 +75,7 @@ Contents
 .. toctree::
    :caption: Contents
 
+   conf
    sphinxnotes_any
    changelog
 
diff --git a/docs/sphinxnotes_any.rst b/docs/sphinxnotes_any.rst
index ceaa691..3d47b7d 100644
--- a/docs/sphinxnotes_any.rst
+++ b/docs/sphinxnotes_any.rst
@@ -13,3 +13,7 @@ The ``example`` Object
 ======================
 
 .. autoobj:: any:example
+
+   The default value of the ``:style:`` option can be controlled by the
+   :confval:`project_example_style` config, which accepts ``grid`` and ``tab``
+   and defaults to ``grid``.
diff --git a/src/sphinxnotes/project/__init__.py b/src/sphinxnotes/project/__init__.py
index 6b53ab9..c1f542c 100644
--- a/src/sphinxnotes/project/__init__.py
+++ b/src/sphinxnotes/project/__init__.py
@@ -21,6 +21,7 @@ def setup(app: Sphinx):
     meta.pre_setup(app)
 
     from . import sphinxnotes_any, sphinxnotes_render_ext
+
     sphinxnotes_any.setup(app)
     sphinxnotes_render_ext.setup(app)
 
diff --git a/src/sphinxnotes/project/sphinxnotes_any.py b/src/sphinxnotes/project/sphinxnotes_any.py
index 7e9974e..f90bf87 100644
--- a/src/sphinxnotes/project/sphinxnotes_any.py
+++ b/src/sphinxnotes/project/sphinxnotes_any.py
@@ -14,6 +14,9 @@
 from typing import TYPE_CHECKING
 from os import path
 
+from sphinx.config import ENUM
+from sphinx.errors import ConfigError
+
 if TYPE_CHECKING:
     from sphinx.application import Sphinx
     from sphinx.config import Config
@@ -37,6 +40,14 @@ def _read_template_file(name: str) -> str:
     return open(_get_template_file(name), 'r').read()
 
 
+def _validate_project_example_style(style: str) -> str:
+    if style not in {'tab', 'grid'}:
+        raise ConfigError(
+            'The "project_example_style" config value must be "tab" or "grid".'
+        )
+    return style
+
+
 ANY_OBJECT_TYPES = {
     'version': {
         'schema': {
@@ -61,11 +72,15 @@ def _read_template_file(name: str) -> str:
         'templates': {
             'obj': _read_template_file('example'),
         },
-    }
+    },
 }
 
 
 def _config_inited(app: Sphinx, config: Config) -> None:
+    config.project_example_style = _validate_project_example_style(
+        config.project_example_style
+    )
+
     if v := config.any_object_types:
         v.update(ANY_OBJECT_TYPES)
     else:
@@ -75,5 +90,11 @@ def _config_inited(app: Sphinx, config: Config) -> None:
 
 def setup(app: Sphinx):
     app.setup_extension('sphinxnotes.any')
+    app.add_config_value(
+        'project_example_style',
+        'grid',
+        'env',
+        types=ENUM('tab', 'grid'),
+    )
     # Should have priority over sphinxnotes.any's "config-inited" callback.
     app.connect('config-inited', _config_inited, priority=400)
diff --git a/src/sphinxnotes/project/sphinxnotes_render_ext.py b/src/sphinxnotes/project/sphinxnotes_render_ext.py
index 8d3ba20..5ab8565 100644
--- a/src/sphinxnotes/project/sphinxnotes_render_ext.py
+++ b/src/sphinxnotes/project/sphinxnotes_render_ext.py
@@ -9,14 +9,35 @@
 :copyright: Copyright 2025 Shengyu Zhang
 :license: BSD, see LICENSE for details.
 """
+
 from __future__ import annotations
 from typing import TYPE_CHECKING
 
+from sphinx.config import ENUM
+from sphinxnotes.render import filter
+
 from .sphinxnotes_any import _read_template_file
 
 if TYPE_CHECKING:
+    from collections.abc import Iterable
     from sphinx.application import Sphinx
     from sphinx.config import Config
+    from sphinx.environment import BuildEnvironment
+
+
+def _format_autoconfval_types(valid_types) -> list[str]:
+    if isinstance(valid_types, ENUM):
+        return [f'``{c!r}``' for c in sorted(valid_types._candidates)]  # pyright: ignore[reportPrivateUsage]
+    return [f':py:`{t.__name__}`' for t in valid_types]
+
+
+@filter('autoconfval_types')
+def autoconfval_types(_: BuildEnvironment):
+    def _filter(valid_types) -> Iterable[str]:
+        return _format_autoconfval_types(valid_types)
+
+    return _filter
+
 
 DATA_DEFINE_DIRECTIVES = {
     'autoconfval': {
@@ -47,6 +68,7 @@
     },
 }
 
+
 def _config_inited(app: Sphinx, config: Config) -> None:
     if v := config.render_ext_data_define_directives:
         v.update(DATA_DEFINE_DIRECTIVES)
diff --git a/src/sphinxnotes/project/templates/autoconfval.rst b/src/sphinxnotes/project/templates/autoconfval.rst
index 8832ded..b6efdfa 100644
--- a/src/sphinxnotes/project/templates/autoconfval.rst
+++ b/src/sphinxnotes/project/templates/autoconfval.rst
@@ -3,15 +3,8 @@
 .. role:: py(code)
    :language: Python
 
-{% set types = [] %}
-{% for t in opt.valid_types %}
-   {# "<class 'str'>" → "str" #}
-   {% set t = t | string %}
-   {% do types.append(t[8:-2]) %}
-{% endfor %}
-
 .. confval:: {{ name }}
-   :type: {{ types | roles('py') | join(',') }}
+   :type: {{ opt.valid_types | autoconfval_types | join(', ') }}
    :default: :py:`{{ opt.default | pprint }}`
 
    {%- for line in opt.description.split('\n') %}
diff --git a/src/sphinxnotes/project/templates/example.rst b/src/sphinxnotes/project/templates/example.rst
index be16592..ef1186a 100644
--- a/src/sphinxnotes/project/templates/example.rst
+++ b/src/sphinxnotes/project/templates/example.rst
@@ -1,4 +1,5 @@
-{% if not style or style == 'tab' %}
+{% set effective_style = style or load_extra('env').config.project_example_style %}
+{% if effective_style == 'tab' %}
 .. tab-set::
 
    .. tab-item:: Result
@@ -14,7 +15,7 @@
          {% for line in content.split('\n') -%}
          {{ line }}
          {% endfor %}
-{% elif style == 'grid'  %}
+{% elif effective_style == 'grid'  %}
 .. grid:: 1 1 2 2
    :gutter: 1
    :margin: 0