storybook/docs/_snippets/storybook-preview-custom-toc.md

export default {
  parameters: {
    docs: {
      toc: {
        contentsSelector: '.sbdocs-content',
        headingSelector: 'h1, h2, h3',
        ignoreSelector: '#primary',
        title: 'Table of Contents',
        disable: false,
        unsafeTocbotOptions: {
          orderedList: false,
        },
      },
    },
  },
};

// Replace your-framework with the framework you are using (e.g., react, vue3)
import { Preview } from '@storybook/your-framework';

const preview: Preview = {
  parameters: {
    docs: {
      toc: {
        contentsSelector: '.sbdocs-content',
        headingSelector: 'h1, h2, h3',
        ignoreSelector: '#primary',
        title: 'Table of Contents',
        disable: false,
        unsafeTocbotOptions: {
          orderedList: false,
        },
      },
    },
  },
};

export default preview;