Studio's Presenter view consists of four main sections, the view layout tabs, your primary viewport, the presenter controls, and the presenter chat.
Across the top of the Presenter view are your different view layouts. Clicking on one of the layouts will switch to that view layout. More info
Next is your primary viewport, while the way this looks can change depending on your selected view layout, it will always include a preview of your own camera to the left and the live program. If any view other than the "Live" view layout is selected, it will appear to the left with your camera.
The last area which appears below the Presenter controls is the Chat. This allows you to communicate backstage with other presenters or the director. You can also share files and documents on the chat by clicking on the (+) button and hitting enter/ return after selecting the file(s).