Tap Choose a New Wallpaper. It’s the option above the preview of your current wallpapers.
The default wallpapers include dynamic wallpapers, which offer a little bit of motion, like bubbles floating up through water, while Stills are frozen images. You can also choose to use your wallpapers from your camera roll or images that you downloaded.
Wallpapers marked with a half-dark, half-light circle icon will change when you activate Dark Mode. Tap the rectangle icon with arrows pointing out of it to turn on Perspective Zoom (it’s centered at the bottom of your screen), which makes your wallpaper appear to move when you angle the iPad. This feature isn’t available with all wallpapers.
