Customize a presentation by selecting a background image.
Right-click a presentation and select View Setup.
You can also double-click a presentation to enter the setup tab.
Drag and drop Background Image from the right tree into the canvas.
Select an image from the image library.
For the cleanest look, use an image that’s 1920 x 1080 or 1280 x 720.
Click Preview to check it out.
And that’s it!