There are 2 primary views for a Meeting Room. The Presenter View will show you the current and active speaker, and the Gris View will show you the Room together. (The presenter is highlighted in blue when speaking.)
To change views, follow these steps:
1 - Click the grid "squares" icon in the bottom right.
2 - When in Presenter View, a "film reel" of recent presenters will appear under you on the right. You can hide them by pressing the ">" in the bottom right coroner too.