Click a slide you want to move and drag it to the desired spot in the order.
Release the mouse button to drop the slide in the new location.
The slide is moved and the other slides reorder.
INTRODUCTION
You can quickly and easily rearrange the order of your PowerPoint slides. For example, you might decide you want to place your graphical slides earlier in your presentation to draw the attention of the audience.
TIP
Undoing an Action
If you move a slide to the wrong location, click the slide and move it again. Alternatively, click the Undo button on the Standard toolbar (or press Ctrl+Z) to undo your last action of moving the slide.