Scroll down to see how to do this in Symphony 1.5
In Symphony 2.0:
In the chat you wish to deactivate, click on the three-dot menu in the top right to access chat details (figure 1).
Figure 1 Open chat details
Select Deactivate room at the bottom of chat details (figure 2).
Figure 2 Deactivate a chat room
Confirm that you want to deactivate the room and it will be removed for all room members.
Note: You can only deactivate group chats or chat rooms that you are an owner of. You cannot deactivate direct chats.
In Symphony 1.5:
In the room, click on the i in the top right for Chat Details. Open the Options menu, then click Chat Settings (Figure 1):
Figure 1 Open Chat Settings
Select Deactivate Room at the bottom of the menu (Figure 2):
Figure 2 Deactivate Room
Confirm that you want to deactivate the room and it will be removed from your left nav.
Note: You can only deactivate rooms that you an an owner of
Note: If a room is deactivated incorrectly, orphan rooms can be accidentally created. Refer to the Knowledge Article found here on orphan rooms for further information