With our borderless design, people can have conversations with your team on your website and web apps without needing to open the full Messenger:

Borderless conversations appear on the desktop web Messenger when you send chat full messages, and for all the conversation replies your teammates send. 

Note: When a user closes a borderless conversation, it returns to borderless again only when a teammate replies. 

Can an end user trigger it?

No, borderless conversations only trigger from teammate messages. 

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