Overview
On this page
Settings
When Full Screen Presentation Mode first opens, you will be presented with a screen similar to the one above, allowing you to define your preferred settings and get everything ready for your presentation. More details here
Boards panel
On the left side of the screen, you'll find the Boards panel. It is functionally identical to the Boards panel in the main editor. You can use it to navigate your project (if you aren't using linking), or you can use it to rename/duplicate/delete boards.
Comments
On the right side of the screen is the Comments panel. It shows the comments on the current board, and people who can comment on the project can add comments there too. To hide it, uncheck Comments in the Settings Panel or press C.