Many new changes have shown up in PowerPoint 365 for Windows and several other versions released in the past. However, one thing that has not changed is PowerPoint’s tri-paned interface! So why is the interface called tri-paned? Are there three distinct regions within the PowerPoint 365 interface? Yes, the Slide Area is one of three principal regions in PowerPoint 365; the other two being the Slides Pane and the Notes Pane. The Slide area is where you work the most, typically through adding and editing slide objects.