These shortcuts make it easier to navigate and organize large slide decks from the Outline tab of PowerPoint.
Collapse all slides to slide topics only by clicking ALT+Shift+1.
Expand an individual slide to show bullet points or slide content when you use ALT+Shift+Plus.
Break down a single slide to topic only by hitting ALT+Shift+Minus.
Open all slides to slide topics and content with ALT+Shift+A.