Facebook Messenger allows you to hide private messages by sending them to the Archive folder.To delete archived chats in Messenger for desktop, visit messenger.com, open the Archive section, select the chat, and click Delete Chat.To delete archived messages in Messenger for mobile, open the Messenger app, go to Archived chats, long press on the chat, and tap Delete.For more help with Archived chats, refer to the guide 'How to Hide Messages on Messenger (Desktop & Mobile)' by TechViral.