Yes. Suppose you create a page "salon", you add the messenger block on this page. It will create a channel "Salon", having access to this page can discuss from it. Note that here the height of the block is not total.

Side messenger, you will find this channel "salon", it is public. So the custom page serves as an entry point in a way. then, that you discuss on this channel in your messenger or on the page custom returns to the same.