After you adjust the bounding box, if there are still areas of your image that are purple that are not supposed to be purple, go to the Background Removal tab in the Ribbon. Remember, any areas that are purple are considered background areas by Word.
Click the Mark Areas to Keep button.

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Your cursor will turn into a pencil.
Simply click on an area that you want to keep.

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As shown in the snapshot above, a plus sign appears where you clicked. If you look at our previous snapshot, you can see this area used to be purple, but by clicking on it, it's restored to its original color.

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We can now click on all areas we want to keep.

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You can also mark areas of your image for removal. It's quite possible that Word will not detect all background areas, so those areas will not appear purple. To mark areas you want the tool to remove, go to the Ribbon and click Mark Areas to Remove.
Click on the areas to remove just as you clicked on the areas you wanted to keep. However, this time, those areas will turn purple.