If you want to change your default black background color, a common way is to make a solid layer with preferred color then move it to the back.

Another, less common, way of doing this is to just change the background color. Hit Ctrl+Shift+B and you will get this window:
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You may find yourself working on a dark or light project with very little contrast. A simple display adjustment can help you navigate through you without having to hunt for those low contrast elements. You will find the "Adjust Exposure" icon to the bottom right of your display window. Changing this only affects your display and will not change rendered output. read more