If your PowerPoint presentation is not displaying all of the content in slide show mode, here are some suggested steps to take:

1. Open the PowerPoint presentation in ‘Normal View’.
2. Check the ‘Slide Master View’ to see if the content has been hidden at this level.
3. Check the ‘Slide Sorter View’ to identify any hidden slides.
4. Verify that the ‘Presenter View’ settings are enabled.
5. Check the ‘Presentation Options’ for any hidden content.
6. Verify that the background color and settings are appropriate for all slides.