You might be more focused if the Facebook conversations you’ve read and handled aren’t lingering in your message inbox. You can delete conversations. However, archiving messages hides them from your inbox until the next time you message that person.
What happens when you archive a message in Messenger?
When you archive a conversation in Facebook Messenger, it moves to a separate folder. This keeps your inbox clean and organized.
Archive Facebook conversations on the Messenger screen in a computer browser. There are a couple of ways to get there.
Select the Messenger icon in the top right corner of the Facebook screen.