In presentation mode, you can orbit or walk around a scene, view slides, behaviors, and alternatives, and click on 3D triggers, but not change the scene in any way. Most windows and controls are hidden until you toggle back to edit mode.
Presentation mode is intended for presenting concepts to managers and other colleagues, or for letting them explore on their own.
Turn on/off presentation mode
You can tell you’re in presentation mode when the cursor appears like this.
In addition, a message at the bottom of the window says “Walk” or “Orbit.”