The Wallpaper picker opens in a new window, and you have a few options to choose from for your new background.
Right-click-or two-finger tap-anywhere on the desktop, then click on “Set Wallpaper.” The first thing you’re going to want to do is to open up the Wallpaper picker. When choosing a wallpaper to use on your Chromebook, you can select from a wide range of pre-installed images or any of the images saved to your computer using the Wallpaper app. Here’s how to customize the background and theme on your Chromebook. Personalizing your computer with a new wallpaper or fresh theme is one of the first things people do when they initially set it up, and Chrome OS is no different.