How to Delete Messages From Facebook Marketplace?
3 Ways to Recover Permanently Deleted Messages on Facebook
Recover Permanently Deleted Messages on Facebook Messenger
Find the conversation that you want to delete and swipe it to the left.
This will show you the different actions you can do for a message.
This is the same for chats with more than two members in it.
Spend sometime on Facebook to check your chat history.
It will vanish from your mobile device, browser app, and desktop app.
You can still access the conversation by searching for it.