Laptop sleep feature question

I have a few questions about the rejoin feature when a laptop sleeps and comes back to an open call.

The first is question is related the rejoin button. Is this button supposed to close the chat window and make the user rejoin the call in a chat window? Or is the button supposed to immediately rejoin the call?

Also is there a way that I can change this behaviour? When the user is alone in the call and sleeps their laptop they will be brought back to the rejoin page but the call is already closed.