Show or hide slide numbers
You must be in navigator or light table view to add slide numbers.
Show slide numbers
To hide slide numbers, select the slide or Slides with numbers, then deselect Slide Number.
To show slide numbers for all Slides in your presentation, choose Slide > Show Slide Numbers on All Slides (from the Slide menu at the top of your screen). To hide slide numbers for all the Slides in your presentation, choose Slide > Hide Slide Numbers on All Slides.