MindManager has a Presentation Mode which removes some of the clutter (toolbars). For a simple map you can just use the control buttons.

For more complex maps using a few short cut keys will help:

Ctrl-F5 Fitmap to screen.
F3 Centre selected topic and close down all other main topics
F4 Hide everything except the selected topic and its sub-topics. Press F4 again to reveal all the topics.

And a final tip. Put tables and pictures in notes. Ctrl-T will toggle notes on and off.

You can edit the map in Presentation Hade and capture audience feedback.