Upon review of a completed PowerPoint presentation, you may find that you'd like to rearrange, add, or delete some slides.
Reorder a PowerPoint Presentation
In order to change the order of slides in a presentation, you must view your presentation on Normal mode. To do this, go to View > Presentation Views > Normal Mode. The left pane will contain your presentation outline and slides tabs. Click on the Slides tab.
All the available slide will be shown. You may rearrange the order of the slides by simply dragging them to the desired place. Use the CTRL key to select multiple slides at one time:
Delete a PowerPoint Slide
You can also use the Slides tab to delete any unwanted slides. To do this, simply right-click on the slide of your choice, and select Delete Slide.