Touch Mode is a new feature available in PowerPoint 2013 that is useful for touch-enabled system. This feature adds more space around buttons and icons in Office so you can tap them more easily in your smartphone or tablet. This can be really useful for users who use Microsoft Office from their touch-screen devices.
You can enable touch mode in MS Office by right clicking on the top Quick Access bar and then choose to enable the command Touch Mode.
If you plan to use powerpoint in a touch enabled system then you can take advantage of this touch mode button.