Click the i in the top right of a chat to see Chat Details then click on About This Chat to read the room description (Figure 1):
Figure 1 About This Chat
Click on Options then Customize Chat to create a chat room alias, assign a color, and adjust room notifications or settings (Figure 2):
Figure 2 Customize Chat
Click on Members to view all room members and their roles (Figure 3):
Figure 3 Members
Click on Files to see all file attachments shared in this room (Figure 4):
Figure 4 Files
Note: Your view of Chat Details varies depending on your role in that room and whether or not files have been shared