By default, you can view everybody in a meeting from the Main Meeting window (Figure 1):
Figure 1 Meeting members
Note: The current default limit for a meeting is 100 members. This figure may vary depending on your company policy.
If desired, you can select Change Layout to switch the meeting view between Grid and Sidebar (Figure 2):
Figure 2 Change layout
Select Show People from the Main Meeting window to display the microphone and camera status of all members in the meeting (Figure 3 and Figure 4):
Figure 3 Show People
Figure 4 People