> For the complete documentation index, see [llms.txt](https://en.help.firstline.cc/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://en.help.firstline.cc/feature/channels/advanced-features.md).

# Advanced Features

- [Recall a single message](https://en.help.firstline.cc/feature/channels/advanced-features/recall-a-single-message.md)
- [Block contact](https://en.help.firstline.cc/feature/channels/advanced-features/block-contact.md)