By default, you will enter a Symphony meeting in the Main Meeting window, unmuted and with your video turned off.
However, you can pop out an individual meeting from workspace or a stand-alone chat to maximize room on your screen (Figure 1):
Figure 1 Pop Out
Additionally, you can then select Fullscreen to give you the most comprehensive meeting experience available (Figure 2):
Figure 2 Fullscreen
If during a meeting you wish to open the chat or view something else in Symphony, you can view the Smaller Meeting window whilst staying in the meeting by navigating away from the Main Meeting window (Figure 3):
Figure 3 Smaller Meeting window