If you find that your Contacts (friends list and groups list) window has become detached (“torn off”) from your conversations (IM and group chat) window, then proceed as follows:
If you do not see the ⇱ icon then please follow method 2 below.
Make sure the Conversations window is open; if it isn't, open it with top menu
, Comm → Conversations, or Ctrl-T.
Make sure the Advanced
menu is enabled; if it isn't, enable it with Ctrl-Alt-D.
In that window, type in ContactsTornOff, then click on FALSE; close the Debug Settings window.
Close the Conversations window and the Contacts window, if it is open.
Open Conversations, then open Contacts (top menu, Comm → Contacts, or Ctrl-Alt-Shift-F).
They should snap back together. If not, try a viewer restart.
For the Nearby Chat window torn off, see this page.