The Flexible Sections format gives you additional control over your Moodle course layout. Flexible Sections closely resembles the Topics format, with some important changes.
- Unlimited sections
- Add/remove sections as required
- Nest sections to any depth
- Each section (regardless of its nesting level) can be shown expanded or collapsed
- Hiding a section hides all nested sections and activities
See the official Moodle documentation on the Flexible sections course format for full information and examples.