If you want to adjust the position of the background image in LibreOffice, it's very easy.

1. Select View Menu 
View

2. Select Navigator or press F5, it will open a navigator box
Navigator

3. Double click Image, a selection of images will appear with the names image 1, image 2, image 3
4. Double click on image 1, image 2, or image 3 to activate it

5. If the image is already active, hover over the center of the image so that the cursor changes to a plus sign
6. Click and hold the image then place it in the position you want.
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