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There is no way to do it from within Live Photo Gallery, but you can change a setting in the Windows registry to accomplish what you want. You can CLICK HERE to download an automatic fix. Just click the link and then open the file after download to merge it with your registry. Then open Live Photo Gallery and it should have a black background.
If you prefer to do it manually you can use the instructions below. Thanks!
Everything worked just as you said it would. Thanks for your expertise. I really appreciate it.