Background Settings
This section describes settings to change the desktop background located in the Background tab. Alternatively, this option is available by right-clicking anywhere on the desktop and selecting Change Background....
Note: Background modes such as centered, scaled, spanned, stretched, tiled, and zoomed can be set using the GNOME Tweaks application: GNOME Tweaks Appearance Settings

Set Pre-installed Images as Wallpaper
Select an image from the list. There is no “apply” button; the desktop background will update automatically when an image is selected.

Set User Images as Wallpaper
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Click
Add Picture…and navigate to the location of your image.
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Click
Open.
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Select the image added to the list of available wallpapers.

Alternatively, right-click the image and choose Set as Wallpaper from within the file browser.
