To create an unattended presentation:

  • Ensure all animation effects are set to appear automatically. Use the Timing Options command on the effect's action menu and configure the effect to happen automatically after a prescribed delay.
  • Ensure that all slides are set to advance automatically. You can configure automatic advance in the Slide Transition task pane, or rehearse the presentation once to capture timing.

    Advance slide options in Slide Transition task pane

  • Choose Slide Show → Set Up Show and select Loop continuously until 'Esc'. Also ensure the Advance option is set to Use timings, if present.